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  1. Replies
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    Re: Got a couple lenses that I can't figure out

    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.
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    Re: Need Grubb Lens Expertise

    I'll browse my literature and come back to you.
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    Re: petzval coverage question

    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...
  4. Re: Hugo Meyer Doppel Anastigmat f5 resurrected....sort of.

    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.
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    Re: Zeiss Ikon Ikonta 520/15 ?

    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...
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    Re: What actually makes a Darlot special?

    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...
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    Re: remounting old lenses

    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.
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    Re: Single element lens design questions...

    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...
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    Re: Ernst Leitz Wetzlar 400mm - ?

    An episcope or epidiascope, to be a bit more specific :)
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    Re: need some help with this old shutter

    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...
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    Re: Soft Focus Lens Article - Part 2

    I will share the articles as soon as I find the time to scan them (probably this weekend).
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    Re: Soft Focus Lens Article - Part 2

    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"...
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    Re: Your Oldest Lens

    My oldest is probably a Liesegang Globe lens (Kugellinse). It was made in Elberfeld, this dates it to 1854-1971.
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    Re: Another mystery lens (who's the maker?)

    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.
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    Re: Anybody know what lens this is?

    Aero Ektar 178mm f 2.5 ?
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    Re: Best Solvent To Remove Film Holder Tape ?

    If it is an unknown plastic, use alcohol, it is pretty safe and works. Other solvents might work better but might damage plastics...
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    Re: Ernemann-Werke A.G. 360mm f4.5?

    I'm just guessing but this might have been a lens that was used on an episcope/epidiascope (also known as opaque projector).
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    Re: A quick question about Large Format Optics...

    Also, it would require a larger setup. Smaller and lighter setups are generally preferred ;)
  19. Re: Some of my favorite things........5" No Name Petzval on 4X5

    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!
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    Re: Is THIS the Holy Grail?

    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...
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    Re: Is THIS the Holy Grail?

    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...
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    Re: Repromaster lens @ infinity ?

    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).
    ...
  23. Re: Emil Wünsche AG Reicka Extra Rapid Aplanat No.2 f/5,5

    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...
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    Re: Repromaster lens @ infinity ?

    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...
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    Re: Who knows this petzval lens ?

    Here is something similar:

    http://photo.net/photodb/folder?folder_id=939852

    But not it...
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    Re: Is THIS the Holy Grail?

    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...
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    Re: Is THIS the Holy Grail?

    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 ;)
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    Re: Does anyone knows this lerebours lens ??

    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.
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    Re: Gasc & Charconnet Petzval

    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...
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    Re: Gasc & Charconnet Petzval

    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...
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    Re: Gasc & Charconnet Petzval

    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...
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    Re: SOM Berthiot Eidoscope Portrait Lens

    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...
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    Re: Differences in petzval makers - Significant?

    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. ...
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    Re: Differences in petzval makers - Significant?

    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:
    ...
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    Re: Differences in petzval makers - Significant?

    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...
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    Re: Small Page on the Harrison GLOBE LENS

    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.
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    Re: faster lens for speedgraphic?

    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.
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    Re: how to mount a cinephor lens

    Use a rubber band wrapped around the barrel to provide a rim to mount to your universal iris mount.
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    Re: Old brass shutter

    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...
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    Re: Old brass shutter

    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. ...
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