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Thread: Leightweight long lens over 600 for 4x5 / 5x7 suggestions?

  1. #41

    Leightweight long lens over 600 for 4x5 / 5x7 suggestions?

    A more thorough testing showed that there is a serious issue with mechanical vignetting which can only be solved by stetching the bellows when possible. This, I'm afraid, makes it probably impractical for formats larger than 4x5. Please read the update.

    http://www.paulschilliger.com/Temporaires/lens_test

  2. #42

    Leightweight long lens over 600 for 4x5 / 5x7 suggestions?

    It's time for a final evaluation of the idea of using the Horseman converter to make extra long lenses out of the 300 (900mm) and 450 (1450mm) Fujinon C. I have a few film sheets before my eyes, and there is not much to boast about them.

    The 5x7 sheets have black corners despite my checkup for the pupil from the corners of the ground glass. I wish I had doubled some of them with normal lenses, for they were nice... The 4x5 are just "exploded" "large format 6x7" as far as sharpness is concerned. They remind me of my old 600mm tele lens when it was closed at f45, even worse. In addition, the corners are soft. There was a lot of trouble composing and focussing on such a dark ground glass (f32 for the 300 and f45 for the 450). Some speeds are not recommended with such long lenses (1/2-1/4-1/8) and that's just where the images had to be taken. Using a second tripod didn't help making work easy.

    I guess I had some fun experimenting, and I hope you didn't bother reading it! P.S. do not look for the test page, I deleted it.

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