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Forum: Optics Theory - 02-05-2019
Replies: 57
Views: 3,194
Posted By Rob-F
The full term is "apochromatic." It means that...

The full term is "apochromatic." It means that the three primary colors, red, green and blue, all come to a focus in the same plane. A non-APO lens might typically bring only two of three primaries...
Forum: Optics Theory - 02-04-2019
Replies: 57
Views: 3,194
Posted By Rob-F
I didn't see an option that reflects my...

I didn't see an option that reflects my understanding, either.

To me, the ASPH lens has the potential to perform better at the widest apertures. Stopped down to around f/8, not much difference. Or...
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