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Response to Vignetting problems with Magnifax 4

from Fabio Giacuzzo (giacuzzo@elettra.trieste.it)
Thank you Ed first of all. I have just done all the test that you suggest, all the test was performed with an unexposed negative, here is the results:. a) cheking alignement, the "vignetting shape" are perfectly centered on my easel, so the alignement is perfect! b) changing condenser, 6x9 instead of the 24x36 (printing 24x36 negative; the vignetting was going worse! I dont know why, in fact it will be logical suppose that with a larger condenser the light will be uniform on a larger area, but with the 50mm lens is not true,(this fact is confirmed by the Meopta official site). c) condenser 6x9 and 80 mm lens, the vignetting is about the same of the normal configuration. d) condenser 24x36 and 80 mm lens the vignetting is about the same of the normal configuration. e) measuring the light down on the border: printing a 30x40 picture the borders are down of nearly 1/2 stop than 1/3 stop. Thanks again, Fabio.
(posted 8352 days ago)

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