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  1. Replies
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    Re: Recognizing dagor type G-Clarons

    I own a 355mm Plasmat-type G-Claron, and I would be really delighted to get a Dagor-type one. So I was happy to see the good news that those do exist. But.... That's what I found checking the list:-...
  2. Re: Where are the great shots? Am I a cynicist or a realist?

    No they don't. Guess why? For exactly the same reason you do not want to make it: simply because that number_XXXXX copy of the 'iconic shot' is NOT ART.

    Art is a form of study/exploration. If you...
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    Re: Can you compose better with your left eye?

    I do not have a dominant eye at all. Mine are 'equal in rank', and when focusing on a distant object, I always see two defocused close-up fingers at once.

    I am right-handed, and I used to compose...
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    Re: Turner-Reich modifications?

    That formula is only an approximation. One can get different focal length combinations from the same single cells by changing the distance between those cells. What would the image quality be, is...
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    Re: Turner-Reich modifications?

    Thank you. So those aren't on par with ser.VII Protars.... that makes the TR's of little interest to me, and the only possible alternative is perhaps a Wollensak Ia (bought one also but again...
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    Re: Turner-Reich modifications?

    Thanks for all the answers.

    I'm mostly interested in using the single elements of this lens, and a 28" would be more attractive to me then a 25". But the f/6.8 combinations of 21" and 28" cells...
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    Re: Turner-Reich modifications?

    I've just realized the shorter half was not 17" but 19.7" (500.4mm).... but it's still not 21". And the longer half is marked 25" (635mm), not 28".

    This is the one I've actually bought (it hasn't...
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    Turner-Reich modifications?

    I've browsed the web for Gundlach Turner-Reich convertible anastigmats and found what seemed to be two different types of those. Both were 12" in focal length but one was composed of 17" and 25"...
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    Re: Filter identification required.

    Yes that's ЛЗОС in Lytkarino (Russia, not the Ukrain. Though that made no difference back in the USSR).

    Image SHARPNESS will be the same with or without the ЖС-10 glass (absorbing UV below...
  10. Thread: 20х24" enlarger

    by ridax
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    Re: O-2 600mm f/10

    Yakolev (1970) states 41 coverage for the O-2's so his 12 lp/mm are for the even smaller field then my liberal 50. 41 corresponds to 45cm (17.5") coverage for the 600mm focal length at infinity....
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    Re: Schneider Tele Arton 180mm f5.5 info needed

    It's a standard Schneider Blendenkorper #0. Threads and distances are exactly the same as in a normal modern #0 shutter. The lens can be remounted in minutes.

    Funny enough, I own the 5.5/180 in...
  12. Thread: 20х24" enlarger

    by ridax
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    41,264

    Re: process vs. enlarging lenses

    Never ever heard such an opinion - except that high-end process lenses have less distortion and are thus preferable for multi-piece murals that have to be stitched together. The sharpness story is...
  13. Thread: 20х24" enlarger

    by ridax
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    41,264

    Re: O-2 600mm f/10

    If longitudinal CA is poorly corrected, color fringes are unavoidable. Also, the lateral CA just can't be corrected well when longitudinal CA is not.



    Yes monochromatic light improves sharpness...
  14. Re: What lens will work for a 35x35 inch ULF mammoth wet plate camera?

    Re: Process lenses' coverage...

    Those are different. Celor type ones do not improve in their edge sharpness when stopped down. Tessar type lenses are much better as "poor man's wideangles". The...
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    Re: Best soft focus lens for the money?

    Your PM box is full.
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    Re: 3.25 x 4.25 Graflex

    That's equal to 4 Grafmatics. So I've put mine next to my regular Fidelity Elite 4x5's, and the 4 Grafmatics were nearly as thick as 8 Fidelity holders (though I've seen posts claiming Grafmatics...
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    Re: Tiny Format X-Ray images

    Tiny format? Hmm... I assume the X-ray stuff is cheap because it utilizes some primitive technologies, and thus it must be much coarser in its grain. Has anyone made any direct comparisons to the...
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    Re: 3.25 x 4.25 Graflex

    Yes I'd really like to purchase a slightly used time machine some day :) ....
    But what about the options that not only were but still are?
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    Re: 3.25 x 4.25 Graflex

    How do they compare to Grafmatics? Weight (one 4x5 Bag Mag vs. two 4x5 Grafmatics - for 12 shots total)? Speed of operation? Any other considerations? I appreciate my Grafmatics but have never put my...
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    Re: Albumen vs Gelatin

    (1) Salt prints and albumen prints are not the same.
    (2) Yes both albumen and gelatin serve the same function suspending the silver chloride but albumen servers another function as well.

    Albumen...
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    Re: Still-Life Images, 2015

    Sorry for the delay... I'm an irregular forum visitor.

    FTk-20P is a medium (= normal) contrast blue-sensitive graphic arts film used for making positive copies of continuous tone negatives. "FT"...
  22. Thread: post your trees!

    by ridax
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    Re: post your trees!

    This looks stunningly similar to traditional Chinese painting to me.... I've never imagined photography could ever explore the style!

    Though I'm a complete barbarian and certainly not in position...
  23. Poll: Re: Admiration & curiosity about our venerable, graying shooters

    That's why 5x7" is too small to be watched comfortably with my aging eyes!...
    Good news is, I am still supposed to crop my 8x10"s brutally. ;)
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    Re: safe haven for tiny formats

    Funny enough, my classmate's grand dad owned a FED with exactly the same tab for the aperture on its Industar since the mid 1930s....



    BTW are you also sure that it is not 2 but 3 yeas that...
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    Re: Lenses with hazing

    Yes resolution also goes down with haze - as resolution is a function of both sharpness and contrast....
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    Re: safe haven for tiny formats

    Do you really mean this coated lens is of 1933?
    Are you sure there were any Elmars of the era that instead of the "f=5cm" mark had the "F=50mm" on them - just like the Industars of the 1950s?
    Etc.,...
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    Re: Lenses with hazing

    Yes the common sense says so... but in reality, my very careful tests (some 40x magnification and more) never showed any sharpness degradation due to lens fog, whatever heavy. Image contrast drops...
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    Re: safe haven for tiny formats

    Travelling through the old posts... Certainly it's too late to reply now - and more so as the original poster is not on this forum any more (which is a pity IMO) - but still I can't resist the fun of...
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    Re: ОФ-233 / OF-233 210mm f/2.5

    Besides, a number of aerial lenses were corrected for a pretty wide range of wavelengths but the blue region was not a part of it. Instead, the correction started from the green zone and reached out...
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    Re: ОФ-233 / OF-233 210mm f/2.5

    The intense blue coating like this one

    http://www.photohistory.ru/Pictures/Lens-Uran-27-big.jpg

    is actually enough to give the lens a prominent yellow tint on its own. With a coating like this,...
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    Re: ОФ-233 / OF-233 210mm f/2.5

    Yes indeed I've put my hands on an aerial super-wide-angle (of the Roosinov type) that had one of its elements actually made of a deep yellow filter glass once. (Sorry I've never tried the ОФ-233,...
  32. Re: Gotchas or disadvantages of higher temperature processing

    Beside the difference in individual chemicals' activity at different temperatures (mentioned above), the main problem is that chemical activity is much more dependent on temperature then diffusion...
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    Re: Calumet C-1 improvement

    Thank you for the links. I'll certainly try those.

    And BTW I was really impressed by the fast and smooth turning of the UNC-threaded bolts of the C-1 (which is itself a GREAT camera IMHO). Those...
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    Re: Calumet C-1 improvement

    Oh what a dream it were if that were an option... But on the other side of the Globe, it's not. Not a single hardware store has any non-metric bolts nor nuts here. The only way to go is purchasing...
  35. Thread: Nude

    by ridax
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    Re: Nude

    I am with Mark. I certainly don't feel like that's about chopped-off legs or anything like that; I actually see the cone as a sort of mysterious symbol turning the legs into a mermaid's tail or, more...
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    Re: Rodenstock Eurygonal f4.2

    At f/11 the astigmatic difference would still be 1.5 times more then the depth of focus (assuming 0.1 mm circle of confusion usually said to be OK for contact printing). To make the depth of focus...
  37. Re: Modifying a Petzval projection lens for Waterhouse stops

    Quite true. More so, the earlier Petzvals were actually made for the stops to be in front of the first element, and any Waterhouse or iris inside the barrel would just be wrong for those.

    So for...
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    Re: Rodenstock Eurygonal f4.2

    According to the aberrations curves, at f/6,3 and smaller stops the lens should make its background blur no worse then a Dagor's one (from f/10 on). Wide open, it may (or may not - this really has to...
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    Re: Lens Shutter Sticks

    That reminds me....

    My first (35mm) camera was a Smena. It worked hard for several years but eventually the main spring in the shutter (a simplified version of the Compur clone) got broken. Being...
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    Re: Lens Shutter Sticks

    OK... actually, I used to wash my shutters as I described above, dry those, and then open the front (without disassembling any gears) and apply oil to certain places. Though I've also read about...
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