I too use a 90 on my DIY 6x17, the Fuji f8 in fact. I can't say the fall off is at all worth correcting for on regular silver negative film, i.e. I do not use centre filter. It's a pukka lens.
Eirik (aka Ezzie)
DIY 4x5 | DIY 6x17 | DIY 6x24 anarmorphic pinhole | Pentax' SV & SP 1000 | Rolleiflex | Kalloflex | Weltix | Royal 35-M | Leica M4-2 | Polaroid 250 | Polaroid 110A / 600SE conversion | DIY Polaroid View | DUO Polaroid TLR | Vito CL | Pentacon SIX | Kiev 6C | Canon EF | Mamiya 1000s
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