Hi,
I have a Rodenstock Grandagon 90mm f4.5 lens. I am using it to shoot 5x7 and 6x17. I tried it without a center filter but there was just too much light fall off. While this isn't an issue with b/w, it is with colour negative, as altering the density in post production also changes the colour. I bought a Schneider 82mm IV filter with 1.5 stop correction but there is still a degree of light fall off, to about a stop. The test images were taken with an aperture of f16.
My question is: is this to be expected or would I do better to keep the filter and swap the lens for the Schneider 90mm f5.6, that the filter was designed for. Both lenses have the same angle of view (105 degrees) and 235mm of coverage.
Cheers
Paul
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