Hi Peter:
I figure that my pseudo-SQF grades go something like this:
A = capable of the best 35mm can give
B = acceptable image quality for all but the most discerning shots
C = marginal image quality - won't hold up to enlargement or projection, but
fine for standard size prints.
D = barely discernable details at standard photo lab print sizes
E = a failure
We sound alike.
Someday I'll know a range of resolutions that go with each grade, but for now
it suits my needs: selecting the right lens for the shot and knowing the
performance of their various apertures. (And culling out the poor
performers).
Photographing at a 1:40 magnification ratio is darn close to the average ratio
of all my pictures. I assume it minimizes the close focus aberations that
might show up at your 1:18 ratio.
Your test subject is all high contrast content. A mix of low and high
contrast content is more like the real world. Low contrast resolving power is
a strong test for a lens and the film it's being recorded on. I pay lots of
attention to those details. That is where contrast really comes into play.
You won't see much difference in lens contrast with a high contrast subject -
the letters will just have a lower density.
Lens Test 3 is still in the camera waiting on more lenses.
Gary Reese
Las Vegas, NV
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