10-26-2013, 07:49 PM
There are websites that show sketches of the lens construction for all Canon lenses, and all Tamron Adaptall lenses. Since that is what most of my lenses are I have fallen into the habit of looking at the layout sketch of so many elements in so many groups. I can't say this is criticle information for me, but it is fun. I have not come across diagrams for the Tamron AF 90mm f/2.8 di Macro, ect. The earlier one with the micro motor. Or the Sigma 70-300 so-called APO with the 1:2 macro, and its little brother the Sigma AF 28-80mm f/3.5-5.6 Aspherical with 1:2 macro at 80mm.
Is there someone who knows the layouts of the above three lenses? Much thanks!
- Arthur
Is there someone who knows the layouts of the above three lenses? Much thanks!
- Arthur