R.I.P. Scout26
Full frame and 24MP. http://www.dpreview.com/reviews/sonydslra900/Though any of your "digital" lenses for the 7D are made for its cropped sensor, so will probably vignette pretty badly on a full-frame sensor. Any leftover film lenses work great, though.
I have a 28-100 crop lens that I use quite a bit on 35mm because it's lighter than my good 28-200. Most of the time, I'm zoomed in far enough to not matter, and just use the zoom to adjust framing.Your box camera must be broken. My Ansco Shur Shot Junior stays bright right to the corners on 120 film:
Road between White City and Carlsbad Caverns, maybe?