Dumb question time,
Just thinking, If you use any EF lens on a APS-C body, do you times focal - zoom length by 1.6?
I.E 70 - 200 = 112 - 320, and then with EF-S (Say 17-85 as is) it is as stated, designed for the APS-C processor ??
Trying to work out what lenses will give me the coverage I want. 17 EF-S = 17, and then if correct 17 EF = 27.2 approx.
I think i'm confusing myself.