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Thread: New 75mm Hypergon Lens

  1. #1

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    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.

    Click image for larger version. 

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    It seems the attachment amount has match the limit. Maybe a new thread is needed? I put these updates onto youtube




    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:

    Click image for larger version. 

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    // original post
    It's still a prototype, with modern AR coating
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    I'm still not sure how to manufacture that mini fan (Central ND).
    Should be less then $500 (in CNC mount).
    Attached Thumbnails Attached Thumbnails ed4c0906fc9ab4b58815d23e0837392.jpg  
    Last edited by rayfor; 27-Nov-2023 at 18:48. Reason: Update 2023-11-09

  2. #2

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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!

  3. #3

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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.

  4. #4
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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

  5. #5

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    Re: New 75mm Hypergon Lens

    Also looking forward for updates... I assume for 8x10 format?

  6. #6

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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

  7. #7

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    Re: New 75mm Hypergon Lens

    Drool.... This looks great. Keep us informed. Please...
    Expert in non-working solutions.

  8. #8

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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 ?

  9. #9
    Mark Sawyer's Avatar
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    Re: New 75mm Hypergon Lens

    Quote Originally Posted by Mark J View Post
    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.
    "I love my Verito lens, but I always have to sharpen everything in Photoshop..."

  10. #10

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    Re: New 75mm Hypergon Lens

    Quote Originally Posted by Mark Sawyer View Post
    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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