Quote Originally Posted by Xander Fischer View Post
Also, is there a quality difference between the nikon 90 f/4.5 and the nikon 90 f/8? I assume faster doesn't necessarily designate better lens quality with LF lenses like it tends to for DSLR lenses?
Lens speed and lens quality are utterly unrelated, whether the lens is used on a DSLR, a view camera, a microscope........ of course the ad copy writers will have you believe differently.

The faster lenses are easier to focus (which makes a big difference in the corners of the GG when using an extreme WA lens, as you are) and more expensive - that's it.