The only way to know for sure is to test. Using DOF preview and stopping down can give you a quick check, but since no Pentax viewfinder to my knowledge shows 100% of the frame, that check isn't absolute.
Try one oversized filter and a given step up on your widest lens. Shoot a test shot stopped down to the max. Look for vignetting on the edges. If you don't see it, you're safe. Then buy a bunch of filters of that size and all the other step-up rings you'll need.
-Lon
Amita Guha wrote:
I've been looking around online and some people talk about using step-up rings...could I perhaps use a normal-width filter with a step-up ring and avoid vignetting that way?
Thanks, Amita
But that usually prohibits the use of the hood!
How?
