Regarding the 24mm f/2, here is what a C grade for "vignetting" looks
like in full frame:
http://members.aol.com/olympusom/24f2.jpg
This was an evenly lighted map. In my opinion, B is acceptable and D is
a clear throw-away. Any grade looks worse projected, since there is
light falloff in the image thrown by the projector's condensers and full
aperture lens. Thus, slide shooters who project their slides need to be
even more cognizant of this effect.
Anyone can test their own lenses by shooting an evenly illuminated wall.
Whether or not a C vignetting grade is "a keeper" is strictly in the
eyes of the beholder.
Gary Reese
Las Vegas, NV
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