Quote:
Originally Posted by danachit  I'm looking at the riogrande site and some are color-corrected, some are corrected for spherical & chromatic aberration. Not sure if that's the same thing.
Also, not sure about the focal length?
I'd be happy to follow a link to a good site where a particular loupe was sorta sitting in a spotlight with big arrows pointing to it... 
(I honestly don't know what I'd do without yall.)  |
Danachit,
I think the important one is the correction for spherical & chromatic aberration. It is not the same as the colour correction but you should see to it to get both things in your loupe.
Now I have found what I have been looking for: a loupe of the triplet type has been corrected for distorsion and colour fringing and it should be in a black housing. Now I hope You have all the facts you need to be able getting yourself a good loupe.