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Thread: 20x24 lenses

  1. #41

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    Re: 20x24 lenses

    It is a process lens, won't cover 16x20 at infinity, let alone 20x24. Tessars aren't particularly symmetrical but it seems that Apo-Tessars -- mine are all Taylor Hobson tessar type process lenses, not real Zeiss -- hold their corrections well at infinity.

    If yours is like the few CZJ Tessars I have, the cells should screw out of the barrel, the singlets in the front cell should screw out and so should the rear cell's cemented doublet.

  2. #42

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    Re: 20x24 lenses

    Hey Dan,

    Thank you so much for you reply. Actually I´m a totally newbie around here so I was trying to resolve my doubts reading older posts from specialists in APO lenses like you or Arne. So the fact is I bought this Tessar and I was planning shooting ra4 paper as neg. mostly for still life ( I know is very restrictive) so I was wondering if in this kind of shots could I cover 20x24 inches. As I told you, it´s hard to find many people using it. I just noticed about this gentleman shooting portraits in this size. Plus this info:

    "with a negativ lens -1 dioptrie behind the camera lens you can expand the focus to 1200mm= f:18"

  3. #43
    Mark Sawyer's Avatar
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    Re: 20x24 lenses

    If you're doing still lifes, the Tessar may well cover at close distance.
    "I love my Verito lens, but I always have to sharpen everything in Photoshop..."

  4. #44

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    Re: 20x24 lenses

    Algo, as a newcomer here you may not be aware of this site's resources. The first post in this https://www.largeformatphotography.i...mainly)-lenses discussion has a link to a set of links to sites etc. of interest to LF photographers. One of the links answers the question -- how does a lens coverage grow with magnification? -- you sort of asked.

    Since, however, you have the lens and know the standards to which you work, you ought to ask the lens whether it can do what you need well enough to please you.

    Good luck, have fun.

  5. #45

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    Re: 20x24 lenses

    Quote Originally Posted by Algo después View Post

    "with a negativ lens -1 dioptrie behind the camera lens you can expand the focus to 1200mm= f:18"

    Hey Mark.

    Thanks for the confirmation. What do you think about this statment. It is possible ¿

  6. #46

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    Re: 20x24 lenses

    Quote Originally Posted by Dan Fromm View Post
    Algo, as a newcomer here you may not be aware of this site's resources. The first post in this https://www.largeformatphotography.i...mainly)-lenses discussion has a link to a set of links to sites etc. of interest to LF photographers. One of the links answers the question -- how does a lens coverage grow with magnification? -- you sort of asked.

    Since, however, you have the lens and know the standards to which you work, you ought to ask the lens whether it can do what you need well enough to please you.

    Good luck, have fun.
    Thanks again Dan. I will check carefully, probably I did but I didn't get it.

    Cheers

  7. #47
    Arca-Swiss
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    Re: 20x24 lenses

    The 1210mm F12.5 Apo-Nikkor will cover at infinity. 878mm image circle focused at infinity. You need about 813mm to cover 20x24.
    I have data on these if anyone wants it. email me or PM me.

    Rod
    Rod Klukas
    US Representative
    Arca-Swiss International
    480-755-3364


    Digital Camera Solutions including R-series Technical Cameras, Large Format View Cameras and Ballheads. 480-755-3364

  8. #48
    Arca-Swiss
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    Re: 20x24 lenses

    Bob Soloman reported the following also some years ago:

    1200mm f16 Apo Ronar CL (CL means that it has a linear aperature scale).
    Effective focal length = 1200.1mm; Max. Recommended film size at 1:1 = 40 x 50", Recommended scale = 1/10x - 10x (1x); Minimum aperture = f128, Filter thread = 135mm x1; Overall length = 243mm; Flange focal length at infinity = 1171.5mm; Maximum lens diameter = 150mm, Screw thread = 145mm x1; Contact area to rear edge = 93mm.

    Designed for jobs like map making. Rodenstock made 6 element 600, 800, 1000 and 1200mm Apo Ronar CL lenses. Coverage is 40 to 46° on Apo Ronar CL lenses longer then 480mm.

    For the 1200mm f14 the specs are as follows:
    1200mm f14 Apo Ronar CL (CL means that it has a linear aperature scale).
    Effective focal length = 1199.8mm; Max. Recommended film size at 1:1 = 40 x 50", Recommended scale = 1/10x - 10x (1x); Minimum aperture = f128, Filter thread = 100mm x1; Overall length = 129.5mm; Flange focal length at infinity = 1185.3mm; Maximum lens diameter = 135mm, Screw thread = 120mm x1; Contact area to rear edge = 39.9mm.

    The catalog shows them as both being 6 element.
    Rod Klukas
    US Representative
    Arca-Swiss International
    480-755-3364


    Digital Camera Solutions including R-series Technical Cameras, Large Format View Cameras and Ballheads. 480-755-3364

  9. #49
    Arca-Swiss
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    Re: 20x24 lenses

    Also Doug Bush produced lenses that would cover, though I believe they were made by Milles Grillot for him. See this: https://www.cameraquest.com/degoldenbusch.htm


    He made cameras from 8x10 to 20x24.

    Hope this is useful.

    Rod
    Rod Klukas
    US Representative
    Arca-Swiss International
    480-755-3364


    Digital Camera Solutions including R-series Technical Cameras, Large Format View Cameras and Ballheads. 480-755-3364

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