Need a tele and filter set for my new 7Hi
I just bought a Dimage 7Hi (from Buy.com for $598 after rebate) and want to get a telephoto and a filter set for it. However I want to avoid vignetting as much as possible. I hear that I should choose at least 62mm or larger accessories. Since many different sized step-up rings are available for my 49mm threads, I apparently have a wide selection. Is there a reason to avoid going too big? Is 62mm enough to avoid vignetting? Should I stay below 77mm? What's the upper limit, anyway?