Oh, it does, but that's not the difference between the faster and slower wide-field lenses. The smaller the aperture, the less likely the barrel of the lens will intrude on it. When you get your Sinar, focus your 90 at infinity, open the shutter, and look through the open corner of the ground glass and through the lens. As you dial down the aperture, you'll see that at some point you can see the entire aperture without seeing the lens barrel in part of it. Schneider typically rates the coverage of their lenses at f/22. This effect definitely happens with lenses for 35mm camera--vignetting is always greater at wider apertures.Originally Posted by kevs-2323668
But the difference between f/5.6 and f/8 Super Angulons is the optical design. The f/8 version is a 6-element lens, and the f/5.6 version is an 8-element lens. The f/5.6 version has more coverage by design (it's also bigger, heavier, and when new, more expensive). Within their coverage, both are superb. The current XL series of Super Angulons have more coverage still (but they are still quite expensive). Because 35mm lenses are not used with movements, they are designed to have adequate coverage and the distinction here isn't relevant. Large-format lenses are designed with abundant coverage, and become more desirable therefore, to support more extreme camera movements.
Rick "noting that image quality is more important than coverage in your case" Denney
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