vignetting with wide angles
I'm interested in getting a protective filter for my nikkon 20mm f3.5 UD. I believe that wider lenses should have slim filters to prevent vignetting.
-Anyone know if I should have a slim filter for this lens?
But how would one know if a slim filter is required? Is it just a case by case basis?
I am perhaps interested in the cv 21mm f4.0 (rangefinder)... does that one need a slim filter?