The Canon 300mm f/4 L (non-IS) from the 1990's is one of Canon's discontinued, older and slower telephoto lenses. It does have UD glass. Because I already had the artificial star set up, I decided to see what star shapes look like off-axis on a Canon EOS 6D full-frame body.
Note that this is a contrived test using a 50 micron artificial star, 8m away (because it's cloudy).
And here it is:
It is not bad at all.
Compare to the APM Lomo 80mm f/6 Super-Apo triplet ("the best 80mm APO in the world," according to some), with the Televue TRF2008, which got the best results in my artificial star test:
Not too bad a showing for the Canon, I must say, given that the Canon is a 300mm f/4 (75mm aperture). The Lomo is the equivalent of a 384mm f/4.8 so not too far off.
Conclusion: the Canon superficially looks capable of challenging the "best 80mm APO in the world" on full frame.
Note that this is a contrived test using a 50 micron artificial star, 8m away (because it's cloudy).
And here it is:
Compare to the APM Lomo 80mm f/6 Super-Apo triplet ("the best 80mm APO in the world," according to some), with the Televue TRF2008, which got the best results in my artificial star test:
Conclusion: the Canon superficially looks capable of challenging the "best 80mm APO in the world" on full frame.
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