Windsor C. asks:
<< Or are you saying that the Colorplan could be improved upon? Are
there better projector lenses out there? >>
That is the million dollar question :-) I guess we have ourselves an
off-topic thread going . . .
Leitz doesn't have the corner on the projection lens market, even though
their effective marketing led even yours truly to think so after all
these years.
The single biggest improvement most of us can make is chucking a flat
field projection lens for a curved field.
OK, if people want to test this themselves, for US$2.00 (postpaid), I'll
mail them a benchmark test slide taken at f/8 with a 50mm f/2 Macro
Zuiko. That is the aperture with A+ center and A+ corner SQF grades.
It'll have the finest observable resolution line pair group written on
the mount. (That is the point at which you can no longer observe five
distinct parallel lines in both the horizontal and vertical positions).
Put it in your own projector and through any and all the projection
lenses you own, determine the center and corner group with the finest
discernable detail and report back to me by e-mail. I'll post the
results somewhere down the road. Don't be surprised if the Kodak 102mm
Ektanar C comes out way up there, with about 800f the actual
resolution on film seen when projected. Of course, we can't determine
contrast . . . but if it looks "flat" it isn't cause the slide is flat
in contrast.
Please don't post to the List "I want one." Just e-mail me privately
for my address, which I don't want to broadcast in this publicly
archived list.
Side benefit: you will see just how much detail that a Zuiko can squeeze
onto a 35mm frame, originating from a 60" wide map with some of the
finest detail on any topographic map I've seen (3 years of working in a
university map library considered).
Gary Reese
Las Vegas, NV
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