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  1. #11

    Join Date
    Mar 2003
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    Quote Originally Posted by Donsta
    Sandy

    Today I did a couple of test sheets with the Cooke XVa on 8x10 in every combination. I deliberately shot every sheet close to the edge of the image circle (as close as my camera would allow - I had two inches of shift and about 2 inches of fall where possible) because I would ideally like to use this lens on 11x14 (combined with a 240mm). Two sets of cells provide 5 different focal lenghs. They all cover 11x14 except for the back+back combination which is only usable on 8x10 (273mm focal lengh). The others look like this:

    Front and back - 311mm FL just covers 11x14 (can get about an inch of rise at f64)
    Back only - 476mm FL - covers 12x20 with quite a bit to spare
    Front only - 646mmFL - covers 12x20 with loads to spare
    Front and front - 368mm FL - covers 12x20 straight on

    The negatives are not yet dry, but I will report back tomorrow when they are and I have had an objective look. However, they appear to be plenty sharp right into the corners...
    OK, look forward to your report after examing the dry negatives.

    Sandy

  2. #12

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    Well, they are dry and all of them look better than I expected! I expected the single element negatives to be easilty distinguishable from the pairs, but that is not the case. I wouldn't hesitate to enlarge all of them - so I'm pretty certain that even the most fussy of silver contact printers would be more than satisfied. I will probably shoot some 11x14 test sheets later if time allows.

  3. #13

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    A little more follow-up:

    I went out with the 11x14 yesterday and shot a couple of sheets of film with two different configurations

    1. Front element only - this has a focal lengh of 646mm and as expected, covers with more room than I could possibly use. I used it on a shot where I had significant front tilt and about 5 inches of front rise. The resulting negative is very sharp - right into the corners (which makes me very happy because I just sold my 600mm Fuji C).
    2. Front and Front elements - this has a focal lengh of 368mm. On one negative, I had a significant front tilt and 3-4 inches of front rise - razor sharp right into the corners. I know that this combination covers 12x20 with a little wiggle too, so perhaps it's time to loose the venerable 355 G Claron.

    This confirms for me that this lens has excellent potential for ULF - especially for 11x14 (or 7x17) shooters looking to loose some weight from their gear. I intend combining my twin set of XVas with a 240mm graphic Kowa and that will provide focal lenghs of 240mm, 311mm, 368mm, 476mm and 646mm.

  4. #14

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    Nov 2004
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    Oh my, I need a bigger wallet... and I don't even have much time for photography at the moment. Well, this is quite useful to know. I wonder if the vintage version of the Cooke triple convertible would yield similar results. Thanks very much, Donsta, for posting it. Much appreciated!

    Best,

    Markus

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