The Topcon is an F-theta lens used for laser marking. That should help on finding more info.
The other lens looks a bit like an eyepiece of some sort of optical device.
Type: Posts; User: Wimpler; Keyword(s):
The Topcon is an F-theta lens used for laser marking. That should help on finding more info.
The other lens looks a bit like an eyepiece of some sort of optical device.
I'll browse my literature and come back to you.
Alex, it is much much easier (bellows draw and lens size/weight) and cheaper to use lenses that have a larger image circle so that you can use a shorter focal length then what would be needed for a...
Jim, I am quite sure more then 3-4 people enjoy your photography and tales.
Another great job with this lens. Both the restoration and use! F5 does seem very odd to me, but I like the effect.
There were a lot of rollfilm formats. I think the second number in the zeiss model numbers indicated the format. So in your case, in 520/15, 15 should indicate the type of film/format.
If i...
They had a lot of experience as they were one of the very early lens makers.
They innovated a lot, introducing new designs.
They advertised a lot, and well.
All of their products were made...
Precision custom machining is expensive by the very nature of it. I'd suggest using front/rear mounted or focal plane shutters, or buying lenses already in a shutter.
Convex - concave (meniscus) lenses have better spherical aberration properties then double convex.
Achromatic lenses are corrected for chromatic aberration.
The lenses illuminate quite a big...
An episcope or epidiascope, to be a bit more specific :)
The construction of these things is very simple. Don't have any fear of taking it apart.
I disassembled a similar shutter and they have very few parts. Just a spring, a rotating disk, the...
I will share the articles as soon as I find the time to scan them (probably this weekend).
CC Harrison & others:
I have articles on:
- Ars Koristka: The "Little Ars" Soft Focus Lenses
- "The Possibilities of the Single Lens"
- Dallmeyer-Banfield lens: "A New Soft Focus Lens"...
My oldest is probably a Liesegang Globe lens (Kugellinse). It was made in Elberfeld, this dates it to 1854-1971.
It's french:
9 pouces glace ordinaires.
9 inch, regular glass ;)
There ya go! I can't quite make out the name/initals either, sorry.
Aero Ektar 178mm f 2.5 ?
If it is an unknown plastic, use alcohol, it is pretty safe and works. Other solvents might work better but might damage plastics...
I'm just guessing but this might have been a lens that was used on an episcope/epidiascope (also known as opaque projector).
Also, it would require a larger setup. Smaller and lighter setups are generally preferred ;)
As you have had surprisingly little reaction to this post, I'll just add a "Well done!"
I especially like the 3rd picture. The out of focus coke bottle and risegrass is just fascinating!
In French:
Traité encyclopédique de photographie de Charles Fabre, 1889
(http://www.suaudeau.eu/memo/Fabre/Fabre.html)
In German:
Die Photografischen Objektive, Josef Maria Eder, 1911...
To add to what CC Harrison posted on the historical importance, popularity, value etc:
1. I think the lens was marketed very well. People were really convinced by the point that a lens modelled...
Hmm... The two lenses I own are a Repromaster 213mm f9,25 and a Repromaster 210mm f8. These are very different from eachother in construction/size/lens design (the 213mm f9,25 being much larger).
...
The shutter brand is 'compound'. The camera makers name was engraved onto it.
I don't know anything about this specific maker.
It is hard to judge the scale with no reference, I'd guess it was...
Keep in mind there are different version of the 210mm f9 repromaster, which are completely different design. I'll have to take a closer look to give more details.
Most people seem to be quite...
Here is something similar:
http://photo.net/photodb/folder?folder_id=939852
But not it...
As to the question regarding the image quality:
The abberations are quite well corrected (Consider that this lens is used at small apertures). The biggest issue with the design is that it was...
I own a liesegang globe lens. While I have seen several CC Harrison & Schnitzer ones, I haven't seen another liesegang one.
However, I'm sure either one would get the job done ;)
I checked my literature and while there is a reference to Lerebours et Secretan petzvals, not much more is mentioned. They were based in Paris and started in the 1850's, that's it.
I'm very sorry to wander even more off topic, but can anybody tell me how to tell a globe lens from an aplanat (wide-angle aplanat)?
Also, CCHarrison, are you absolutely sure the picture you...
Not much extra info, just this:
Gasc et Charconnet, Paris changed name to Charconnet et Lavrance, Paris.
This is according to a 1911 book. Maybe you could find out when the change of name took...
Gasc et Charconnet were producing petzval lenses quite early. I will check my information to see wether I find aything more specific.
I would regard this as a "rare", valuable and high quality...
I must say I know little about them. I think I read in an 1922/1923 issue of Amateur Photographer it was one of their favorite lenses. In 1922/1923 however they didn't review any P&S or Hermagis...
OK... My book has 10 pages on the changes in the Petzval lens design over the years.
My time is limited, and reading german takes me some time. Here is some stuff to get the discussion started. ...
You can also browse the database by Name of Inventor. Here is a direct link for Petzval:
http://www.dioptrique.info/base/i/i_petzval.HTM
The inventor list is here:
...
The actual lens design was changed (both upgrades to improve performance, and to avoid patent issues) a couple of times by different manufacturers. The radii of the lenses and the refractive indexes...
I have a german article on this lens. However, it refers to the article by Van Monckhoven, so I doubt it contains any new information.
Thank you for sharing this information.
I own an aldis 150mm f2.8 projection lens. Depth of field is very shallow! Something like that would probably be the closest thing I can think of without going to very expensive (or longer) lenses.
Use a rubber band wrapped around the barrel to provide a rim to mount to your universal iris mount.
In regular conditions, if you cock the shutter just before the exposure, there won't be a lot of forces working on the cylinders. Ofcourse, a lot more care needs to be taken then when compared to...
These shutters are beautiful things. Since they are simple to repair, it is definately worth it. Especially because it will be extremely expensive to mount into a new shutter, if at all possible. ...