Yes I have searched....
I've used an old SA90mm f8 on 4x5, which has been fine, using a 612 back on the 4x5 and enlarging to 36 inches - revealed stonking central sharpness and very soft edges. Which reflects the lens tests that are on the net.
I picked up a Fuji 90mm f8, multicoated and fantastic at 4x5 and 612. However I'm now using a ShenHao 617, and the last 2cm at the edges are moving very quickly into mush territory. Whilst on some subjects that doesn't matter, on images that rely on sharpness and detail - it's just not cutting it. Relying on my school maths and Pythagoras' theorem I think requires a 180mm IC for 617, both the SA and Fuji are well over that.
One advantage of 617 is that I can use my 150 Symmar S as a WA - it's very sharp right to the edge. How can I get that look in a wider angle? If I'm honest I also struggle with the f8 aspect of the Fuji and SA as I take pictures mostly in predawn light - so am setting up mostly at night, a wider aperture would be great. I've stuck with 90mm as that's really as wide as I could go with my Linhof, but with my Shen I can have access to 75-100 range as a wide angle.
In summary, requirements are wide angle 90mm or wider, cover 617 with movements, wider aperture than f8, and crucially - sharp to the edges.
Options would seem to be Nikon 90 f 4.5, rodenstock grandon 90 f6.8
not as expensive as a symmar 80XL would be nice
and the moon on a stick...
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