No Leigh. What you're saying applies only to the on-axis center of the field. With longer focal length lenses relative to film or matching groundglass size, illumination tends to be rather even, but as angles get wider, most lenses have significant illumination falloff from the center. That's why things like center filters and fresnel brightening screens exist. You know that. And the difference might be not slight at all. Some center filters must accommodate two full stops of falloff. In color film work, lack of such correction can potentially spoil the whole shot. Composition and focus is easier on my 4x5 through an f/12 450 Fujinon C lens than an f/4 Nikon 90mm superwide. It's not just the center of the image I'm interested in! I don't own any true wide-angle lenses for 8X10, but instead use either a 250 G-Claron or 240 Fuji A for such purposes. They're wide enough for everything except architectural interiors and tight caves. I imagine a 210 would be just a little harder to manage.
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