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10 Attachment(s)
New 75mm Hypergon Lens
Update 2023-11-28
Here's the link to printables for lensboards and db shutter adapter. https://www.printables.com/model/578...d-for-hypergon
Update 2023-11-09
Finally, the lens is ready.
Elevan Film(https://elevanfilm.com/product/hypergon75/) is the sales agent now. Due to some transaction fee, the final price is USD 539 + p&p.
It's not a volume product so sometime it take a while to ship.
Update 2023-08-18
The filter mount is redesigned with ball bearing. And I found a manufactruer of silicon mask for these perfect aperature.
And the next phase is PVT. So we will see the final product very soon.
Attachment 241605
It seems the attachment amount has match the limit. Maybe a new thread is needed? I put these updates onto youtube
https://www.youtube.com/watch?v=mDTlZxNivUM
Update 2023-08-07
The final color will be shiny black(raw surface in the last post) with shiny brass parts. As for the patent and markings, the Hypergon patent is expired but the C.P.GOERZ is still owned by OPC in germany. I've asked a lawyer, it's not protected in any other countries. But it is still a hitorical trademark so I'm not sure if it is fine to use it on this lens. Maybe IMO GOERZ (In memory of GOERZ) would be better since GOERZ alone is not an trademark.
Another news is for camera. We are going to launch the cheapest 8x10 camera system ECO810. It is an metal light weight modular camera system that is even cheaper than intrepid. We've sold dozens of it in Asia and currently tring to sell it to North Amercia and Europe. There will be another post about it.
Update 2023-07-24
I've made two sample, sandblasted(Fig1 Upper Left) and raw surface(Fig1 Bottom Left), with anodized color.
It seems the one with raw surface looks better, even better than the original hypergon(Fig1 Bottom Right)
Attachment 240845
It's not easy to mount hypergon on any shutter, even sinar db shutter would block some light when shoting 8x10. It seesm it is necessary to build a unique shutter for this lens to work with high speed film. Or maybe adding ND filters is an easier choice?
Attachment 240846
Attachment 240847
// update 2023-06-19
Current status:Engineering sample done, quoting for volume CNC price.
Next phase: Price and pre-ording will be available once I got the price for all parts.
a short video of Engineering sample:
https://youtube.com/shorts/_cBnm087wMM?feature=share
Photo:
Attachment 239703Attachment 239704Attachment 239705Attachment 239706
// original post
It's still a prototype, with modern AR coating
Attachment 238886Attachment 238887Attachment 238888Attachment 238889
I'm still not sure how to manufacture that mini fan (Central ND).
Should be less then $500 (in CNC mount).
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Re: New 75mm Hypergon Lens
How about a circular race ball bearing mechanism surrounding the lens? The "fan" itself (laser cut from thin aluminum and black anodized) would consist of two or three blades...wider in the middle and tapering to very thin where they intersect the edge of the race at three points. The blades would obviously need to be curved downwards towards the edges as the race itself would need to be quite low-profile, so as not to interfere with the image field.
The outside of the race could be cut with gear teeth (or a ring gear attached to the outer circumference)...which are driven by a spring wound mechanism which would be cocked and fired like a shutter. Could utilize something like a slow speed mechanism (could use an existing one?) to keep the fan speed constant. Or perhaps that outer race gear could be incorporated into such a mechanism. If you watch one of these closely in action (remove one from a copal shutter and work it around)...you might see what I'm saying. Would be great I think!
Oh...and you could also incorporate something like a self-timing mechanism for much longer exposure intervals.
Seems like you'd have enough room on the flat of that plate surrounding the lens for something like this. What do you think?
At any rate...its so very exciting to see that you are re-creating such a fascinating lens! (I want one!) Good luck!
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Re: New 75mm Hypergon Lens
ps...a much simpler mechanism would be to attach "fan blades" to the outside of that circular race...and position an air tube near this to blow the fan around - much like the original. Could go either way I guess...but I like the idea of the spring driven model - would be more accurate and adjustable for different time intervals.
Oh...and in either case - of course, as in the original fan, the "axis" needs to be off center (so as not to compromise the image), and the rotating area of this "axis" needs to be figured into the ND forumula.
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Re: New 75mm Hypergon Lens
Nice job! What do you mean for that 500$ as a final price?
Looking forward for updates
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Re: New 75mm Hypergon Lens
Also looking forward for updates... I assume for 8x10 format?
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Re: New 75mm Hypergon Lens
Is this the same lens Jason posted in another thread a few months ago?
https://www.largeformatphotography.i...light=Hypergon
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Re: New 75mm Hypergon Lens
Drool.... This looks great. Keep us informed. Please...
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Re: New 75mm Hypergon Lens
Does anyone understand how the 'fan' worked on the original Hypergon ?
I have wondered about this for years. Surely the pupil size is so small ( ~2mm ) that you could not avoid having a black spot in the centre of the image ?
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Re: New 75mm Hypergon Lens
Quote:
Originally Posted by
Mark J
Does anyone understand how the 'fan' worked on the original Hypergon ?
I have wondered about this for years. Surely the pupil size is so small ( ~2mm ) that you could not avoid having a black spot in the centre of the image ?
The fan spins for most of the exposure time, exposing the outside area of the film/plate. It swings out of the way at the end of the exposure to expose the center. The recommendation is for the exposure time without the fan to be 1/8 of the exposure time with the fan, but that of course depends on the reciprocity failure rate of the film/plate.
The fan-equipped Hypergon was made prior to the invention of center filters, which might be a more practical solution today.
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Re: New 75mm Hypergon Lens
Quote:
Originally Posted by
Mark Sawyer
The fan-equipped Hypergon was made prior to the invention of center filters, which might be a more practical solution today.
Hmm. The VM, not always a reliable source, says that the Hypergon was invented, or perhaps came to market, in 1900. By 1912 Rodenstock cataloged a sort of competitor, the Pantogonal, which covers 125 -130 degrees. R'stock offered a center filter, the Enixantos, for the Pantogonal and touted it as superior to "bunglesome and complicated appliances usually found on extreme angle lenses." Someone recognized optical CF's advantages over mechanical ones almost from the beginning.
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Re: New 75mm Hypergon Lens
I believe that the fan had an asymmetrical axis which rotated around a true (measured) axis - mitigating any "blind spot" issues.
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Re: New 75mm Hypergon Lens
Quote:
Originally Posted by
John Layton
I believe that the fan had an asymmetrical axis which rotated around a true (measured) axis - mitigating any "blind spot" issues.
My understanding is that the fan was rotated and used for half of the exposure, then swung out of the way for the second half of the exposure.
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Re: New 75mm Hypergon Lens
Quote:
Originally Posted by
Bobhoskin
Nice job! What do you mean for that 500$ as a final price?
Looking forward for updates
not as final price, but should be cheaper than that
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Re: New 75mm Hypergon Lens
Quote:
Originally Posted by
Greg
Also looking forward for updates... I assume for 8x10 format?
designed for 8x10, but I've not tested it yet since the edge will become very dark without Central ND
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Re: New 75mm Hypergon Lens
Quote:
Originally Posted by
Hugo Zhang
Nope, I will only provide 75mm hypergon
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Re: New 75mm Hypergon Lens
Quote:
Originally Posted by
John Layton
How about a circular race ball bearing mechanism surrounding the lens? The "fan" itself (laser cut from thin aluminum and black anodized) would consist of two or three blades...wider in the middle and tapering to very thin where they intersect the edge of the race at three points. The blades would obviously need to be curved downwards towards the edges as the race itself would need to be quite low-profile, so as not to interfere with the image field.
The outside of the race could be cut with gear teeth (or a ring gear attached to the outer circumference)...which are driven by a spring wound mechanism which would be cocked and fired like a shutter. Could utilize something like a slow speed mechanism (could use an existing one?) to keep the fan speed constant. Or perhaps that outer race gear could be incorporated into such a mechanism. If you watch one of these closely in action (remove one from a copal shutter and work it around)...you might see what I'm saying. Would be great I think!
Oh...and you could also incorporate something like a self-timing mechanism for much longer exposure intervals.
Seems like you'd have enough room on the flat of that plate surrounding the lens for something like this. What do you think?
At any rate...its so very exciting to see that you are re-creating such a fascinating lens! (I want one!) Good luck!
the original mechanism was elegant but fragile, and hard to control, I'm considering make a modern central ND like the one used by Super Angulon XL.
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Re: New 75mm Hypergon Lens
Quote:
Originally Posted by
Mark Sawyer
The fan spins for most of the exposure time, exposing the outside area of the film/plate. It swings out of the way at the end of the exposure to expose the center. The recommendation is for the exposure time without the fan to be 1/8 of the exposure time with the fan, but that of course depends on the reciprocity failure rate of the film/plate.
The fan-equipped Hypergon was made prior to the invention of center filters, which might be a more practical solution today.
Ah thanks - that solves the mystery !
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Re: New 75mm Hypergon Lens
But would using a central ND filter (or any standard glass filter) cause some issues - due to its refractive properties...when placed over such a curved optic? Just guessing here, mind you!
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Re: New 75mm Hypergon Lens
Quote:
Originally Posted by
John Layton
But would using a central ND filter (or any standard glass filter) cause some issues - due to its refractive properties...when placed over such a curved optic? Just guessing here, mind you!
What if a central ND filter was placed between the two lenses? Maybe not enough room for a shutter, but possibly room for a thin central ND filter. Also just guessing on this end.
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Re: New 75mm Hypergon Lens
Quote:
Originally Posted by
John Layton
But would using a central ND filter (or any standard glass filter) cause some issues - due to its refractive properties...when placed over such a curved optic? Just guessing here, mind you!
I also doubt it would work with a 135° lens that is not retrofocus nor is made according to the Roosinov's aberrational vignetting principle (like all the Biogons, Grandagons, etc., etc.). A spherically curved filter may probably be a solution.... but certainly not a cheap one.
Quote:
Originally Posted by
Greg
What if a central ND filter was placed between the two lenses? Maybe not enough room for a shutter, but possibly room for a thin central ND filter. Also just guessing on this end.
Between the lens elements, the filter just wouldn't work as a center filter.
What I would like is to have an option to put yellow/green/orange/red gel filters inside the lens. It would be good for both modifying the image tones and cutting the influence of the chromatic aberration down.
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Re: New 75mm Hypergon Lens
Quote:
Originally Posted by
ridax
I also doubt it would work with a 135° lens that is not retrofocus nor is made according to the Roosinov's aberrational vignetting principle (like all the Biogons, Grandagons, etc., etc.). A spherically curved filter may probably be a solution.... but certainly not a cheap one.
Please explain further. I ask because Rodenstock's Pantogonal, a 3 element lens and neither retrofocus nor Russar type, was offered with a flat center filter.
"This consists of a plano-convex lens of yellowish green glass which absorbs very strongly blue and violet light, and a plano-concave lens of a colorless, very transparent material. The optical constants of both these lenses is exactly equal so that the cemented lenses act as a plane parallel plate which is dark in the center and transparent at the sides."
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Re: New 75mm Hypergon Lens
Quote:
Originally Posted by
ridax
I also doubt it would work with a 135° lens that is not retrofocus nor is made according to the Roosinov's aberrational vignetting principle (like all the Biogons, Grandagons, etc., etc.). A spherically curved filter may probably be a solution.... but certainly not a cheap one.
Between the lens elements, the filter just wouldn't work as a center filter.
What I would like is to have an option to put yellow/green/orange/red gel filters inside the lens. It would be good for both modifying the image tones and cutting the influence of the chromatic aberration down.
I don't know what is meant by the 'aberrational vignetting' principle. Is it in his original paper ?
The problem with any flat filter used with the Hypergon is that for a ±67.5° field angle, the surface losses from a filter, either used outside or internally, become quite significant at the edge of the FOV and add to the fall-off. Even with AR coatings on the filter, most AR coatings are only better than bare glass out to about 60° incidence.
However, for a centre-filter ( US : center-filter ) , the effect of the internal gradation of the filter will still outweigh these surface-loss problems, so this is worthwhile.
For a coloured filter in the area of the stop, bear in mind that there will still be increasing surface-reflection losses beyond 60° , and that the light path through the filter is also longer for the edge-bundles, so the absorption will be a bit greater than in the centre, though this shouldn't be enough of a barrier to it working OK ... if you can compensate for the filter thickness affecting the effective air-gap.... Gels will probably be Ok though.
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Re: New 75mm Hypergon Lens
Quote:
Originally Posted by
Mark J
I don't know what is meant by the 'aberrational vignetting' principle. Is it in his original paper?
Yes that's the term Roosinov used to call his invention - both in his original papers and in his tutorials on optics (which I own and read from time to time but alas I'm not good enough in mathematics to get it all in). He chose that name because similarly to the common geometric vignetting that changes the lens pupil shape at the field edges, the aberrations he implied also changed the pupil shape off center. But while the geometric vignetting always make the pupil smaller causing light fall-off, the aberrational vignetting is able to increase the pupil size thus diminishing the light fall-off.
Quote:
Originally Posted by
Mark J
for a centre-filter ( US : center-filter ) <...> in the area of the stop, bear in mind that there will still be increasing surface-reflection losses beyond 60° , and that the light path through the filter is also longer for the edge-bundles, so the absorption will be a bit greater than in the centre, though this shouldn't be enough of a barrier to it working OK ...
Here is the most descriptive ray tracing diagram for the Hypergon that I found in my quick internet search:-
https://a4.pbase.com/g4/08/747708/2/...7.fhBJDuo3.jpg
It clearly shows that at the place of the aperture, ALL the rays go through the same small circle in the center, and there is NO way to stop the paraxial rays while letting the oblique rays through. And that's true for any lens of any type.
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Re: New 75mm Hypergon Lens
Quote:
Originally Posted by
Dan Fromm
Please explain further. I ask because Rodenstock's Pantogonal, a 3 element lens and neither retrofocus nor Russar type, was offered with a flat center filter.
"This consists of a plano-convex lens of yellowish green glass which absorbs very strongly blue and violet light, and a plano-concave lens of a colorless, very transparent material. The optical constants of both these lenses is exactly equal so that the cemented lenses act as a plane parallel plate which is dark in the center and transparent at the sides."
Please bear in mind I don't positively state it would not work; I just say I have serious doubts. Those are:-
(1) The surface reflection problem addressed by Mark J above (and that's one of the reasons to suggest a hemispherical filter instead of a plane one),
and
(2) the fact that a plane-parallel glass plate introduces its own aberrations. The thicker the plate, the more pronounced the aberrations are. And the greater the angle, the more pronounced the aberrations are, too. (An ultra-thin pellicle filter would probably work fine. But it would probably cost several times more then the Hypergon itself and be way more fragile than the original Hypergon star/fan.)
The Pantogonal center filter description suggests a pretty thick glass plate in front of the lens; that makes me suppose the Pantogonal was designed from the start to be the most sharp with the filter in place. The Hypergon was certainly not. Perhaps it is possible to modify the Hypergon to be good with the filter but that means lots of new calculations.
A prominent example of the plane-parallell glass plate influence are aireal lenses. Virtually all of them are designed to work with a thick glass plate just in front of the film plane, and perform more or less poorly without it. I've recently tested a bunch of the famous 125mm f/4 super-apochromatic CZJ Pinatar lenses that are often said to be the sharpest glass in the world. Those are for the 6x9cm format and really far from beeing wide-angle but without their 8mm-thick plane-parallel focal plane glass plates, they are really poor performers not worth their own weight....
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Re: New 75mm Hypergon Lens
Roosinov's patent is US2516724A, https://patents.google.com/patent/US...n?oq=us2516724 You have to download the PDF as the OCR'ed text is very poor.
He uses "aberrational vignetting" to refer to the property that decreases the light falloff from cos^4 to cos^3. Today, it is often referred to as a tilting of the exit pupil; Roosinov's diagrams Figs 3-7 and 8-12 illustrate how the pupil shape is less cat-eyed off axis, but he doesn't use the wording of the exit pupil. I am not sure where he originated the phrase aberrational vignetting, but I think he's deliberately relaxing/violating one of the normal lens design assumptions; he speaks of maximum divergence from Abbe's sine condition for the half-lens as seen from the aperture.
The aperture stop in an imaging lens is more or less by definition the "waist" where all the ray bundles from both on-axis and off-axis sources cross. It's conjugate to the image plane (maximally out of focus) and so you can't introduce a center filter there. (Basically the same reason that you can stop down an ordinary lens without cutting off the corners of the field.)
However, there is a big difference between introducing a flat filter in front of the lens and behind the lens. A flat filter (plane parallel plate) will cause a focus shift, and for off-axis sources, introduce some astigmatism because the effect of refraction in the plate on the sagittal and tangential directions is different. In front of the lens, in pictorial use the object is typically very far away (many focal lengths) and the beam from an on- or off-axis source is nearly collimated. This makes the focus shift negligible and means the astigmatism has little effect, although it might still have some effect at the extreme field angles of a Hypergon, someone would have to try it to see.
Behind the lens, the lens to film distance is quite short and the beam for any source, on or off-axis, is strongly converging. This makes the focus shift significant and likely increase the effect of the off-axis astigmatism. That's why for normal, non-Hypergon lenses, we put glass filters in front of them without refocusing or off-axis image degradation, but if a lens is designed to have a rear filter, then it needs that rear filter or it won't perform right. (Common SLR examples include some mirror telephotos and fisheye lenses.) So I don't know if a front filter would yield acceptable results with a Hypergon-type lens, but it is a different case from a rear filter.
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Re: New 75mm Hypergon Lens
Quote:
Originally Posted by
reddesert
...So I don't know if a front filter would yield acceptable results with a Hypergon-type lens, but it is a different case from a rear filter.
Yes indeed it is different.
And I don't know the results of using a center filter in front of a Hypergon either....
Thank you for your thorough explanation.
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Re: New 75mm Hypergon Lens
Totally naive question: what about treating the optic itself with a variable density coating?
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Re: New 75mm Hypergon Lens
Thank you Ridax for the explanation of 'aberrational vignetting'.
I think he could have used a better description, really - after all, it's 'aberrational de-vignetting' ! He deserves to be better-known, for the fine work he did on wide-angle lens design.
It is little known, but there are sets of aberrations (like Seidels) for the appearance and position of pupils, in optics, as distinct from aberrations of the image spots.
The effect you see in wide-angle lenses is largely caused by pupil coma. It can easily be seen in wide-angle optics, looking at the front and tilting the lens around. You can observe the pupil expanding and turning towards you, and the expansion may be greater in the meridional section. This is the effect that enables cos^3 falloff or cos^2 fall-off in modern wide angle optics.
Unfortunately the Hypergon does not display this, and we are stuck with cos^4 ... !
John, it's a good question, it can be done and we have done it sometimes over the years, at work.
it does tend to be expensive though, it requires special masking and 'culotte' rotation in the vacuum-coating chamber, to do a set of lenses graded like this, and the 'plant fill' is much reduced, leading to a higher cost.
You also have to be careful if using a reflecting attenuation ( eg. a very thin layer of aluminium ) , it can cause ghosting problems.
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Re: New 75mm Hypergon Lens
Thanks for the Roosinov patent link.
Quote:
Originally Posted by
reddesert
It's conjugate to the image plane (maximally out of focus) and so you can't introduce a center filter there.
Well.. it's not conjugate, and that's the problem !
The stop is the pupil plane, and there is no separation of the on and off-axis pupils there.
But clearly you understand this and the advice is correct.
I would definitely recommend a centre filter in front of the lens, but it needs to be big enough to cover all the field rays - ie. a lot bigger than the front element. They are not cheap, although some pop up on EBay.
It will reduce the vignetting, but not fully cure it.
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Re: New 75mm Hypergon Lens
Quote:
Originally Posted by
John Layton
Totally naive question: what about treating the optic itself with a variable density coating?
The idea came to me, too. But I am pretty sure such a cener-filter that can't be removed would make the ground glass too dim to see any image - to say nothing about focusing.
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Re: New 75mm Hypergon Lens
Quote:
Originally Posted by
Dan Fromm
Please explain further. I ask because Rodenstock's Pantogonal, a 3 element lens and neither retrofocus nor Russar type, was offered with a flat center filter.
"This consists of a plano-convex lens of yellowish green glass which absorbs very strongly blue and violet light, and a plano-concave lens of a colorless, very transparent material. The optical constants of both these lenses is exactly equal so that the cemented lenses act as a plane parallel plate which is dark in the center and transparent at the sides."
"Yellowish green glass"? Not uranium glass I hope.
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Re: New 75mm Hypergon Lens
Oh yes, it might be - from that period ....
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Re: New 75mm Hypergon Lens
Jeesh...that little fan just keeps looking better and better!
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Re: New 75mm Hypergon Lens
Hey guys, I've decided to make that little fan as central filter. I will upload latest info in the main thread.
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Re: New 75mm Hypergon Lens
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Re: New 75mm Hypergon Lens
Quote:
Originally Posted by
rayfor
Hey guys, I've decided to make that little fan as central filter. I will upload latest info in the main thread.
Viable option of using a laser cutter to cut the thin metal fan and bending the thin metal fan and three wires on separate jigs? A local hobbiest jeweler makes earrings (actually quite similar to the Hypergon fan) and prefers laser cutting metal and bending it to using a 3D printer. Just thinking out loud...
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Re: New 75mm Hypergon Lens
So one needs to have two air bulbs with hose to make an exposure with this lens? One to blow the little fan on the front and the other one for the Packard shutter?
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Re: New 75mm Hypergon Lens
I use a sinar DB shutter rather than a packard shutter so only one air bulb is needed.
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Re: New 75mm Hypergon Lens
Quote:
Originally Posted by
Greg
Viable option of using a laser cutter to cut the thin metal fan and bending the thin metal fan and three wires on separate jigs? A local hobbiest jeweler makes earrings (actually quite similar to the Hypergon fan) and prefers laser cutting metal and bending it to using a 3D printer. Just thinking out loud...
Exactly, I use a 3D printed punching die to bend it.
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Re: New 75mm Hypergon Lens
Quote:
Originally Posted by
Hugo Zhang
So one needs to have two air bulbs with hose to make an exposure with this lens? One to blow the little fan on the front and the other one for the Packard shutter?
I use a sinar DB shutter rather than a packard shutter so only one air bulb is needed. Sinar DB offers accurate and fast(considering its size) shutter speed, which is important if you want to use it with normal speed film in daylight.
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Re: New 75mm Hypergon Lens
Quote:
Originally Posted by
Hugo Zhang
So one needs to have two air bulbs with hose to make an exposure with this lens? One to blow the little fan on the front and the other one for the Packard shutter?
You'll need one air bulb to blow the little "fan", and a second bulb or cable release to release the little fan to fall away during the exposure. With an angle of view that wide, reaching in to release it would put your hand in the image. A Packard shutter would require yet another air bulb, so up to three separate releases.
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Re: New 75mm Hypergon Lens
So glad I have three hands [emoji12]
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Re: New 75mm Hypergon Lens
Quote:
Originally Posted by
rayfor
I use a sinar DB shutter rather than a packard shutter so only one air bulb is needed.
I would love to see a video to show how you use a Sinar DB shutter with this lens. Does the shutter front have enough clearance for the lens rear element?
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1 Attachment(s)
Re: New 75mm Hypergon Lens
Quote:
Originally Posted by
Hugo Zhang
I would love to see a video to show how you use a Sinar DB shutter with this lens. Does the shutter front have enough clearance for the lens rear element?
Attachment 239743
Here's a photo showing how this work. I made a flange to mount the lens diretly onto shutter thread rather than lensboard. There's enough space on both sides.
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Re: New 75mm Hypergon Lens
Quote:
Originally Posted by
rayfor
Attachment 239743
Here's a photo showing how this work. I made a flange to mount the lens diretly onto shutter thread rather than lensboard. There's enough space on both sides.
I see you flipped the Sinar DB shutter over and used the thread on its back to mount your lens. Clever as you can't mount this lens on the front without an adapter which would add more space and probably block the lens coverage.
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3 Attachment(s)
New Hypergon 75mm CNC Sample arrived
Update 2023-07-24
I've made two sample, sandblasted(Fig1 Upper Left) and raw surface(Fig1 Bottom Left), with anodized color.
It seems the one with raw surface looks better, even better than the original hypergon(Fig1 Bottom Right)
Attachment 240845
It's not easy to mount hypergon on any shutter, even sinar db shutter would block some light when shoting 8x10. It seesm it is necessary to build a unique shutter for this lens to work with high speed film. Or maybe adding ND filters is an easier choice?
Attachment 240846
Attachment 240847
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Re: New Hypergon 75mm CNC Sample arrived
Would it be possible to mount the Hypergon directly on a Sinar shutter, meaning do not mount it to a lens board in front on the shutter. Mount it as close as you can to the shutter blades to (hopefully) prevent it from vignetting.
-Joshua
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Re: New Hypergon 75mm CNC Sample arrived
Quote:
Originally Posted by
Joshua Dunn
Would it be possible to mount the Hypergon directly on a Sinar shutter, meaning do not mount it to a lens board in front on the shutter. Mount it as close as you can to the shutter blades to (hopefully) prevent it from vignetting.
-Joshua
I've tried mounting on the thread of sinar shutter, but the blower tube will prevent the lens going deep enough.
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Re: New 75mm Hypergon Lens
They look excellent! Just one question: Who owns the rights to the Goerz name these days?
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Re: New 75mm Hypergon Lens
I'd be a bit concerned that making such faithful copies and putting the Goerz name on them crosses the line into counterfeiting..