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Review Summary
2011-02-19T19:00:00
Following the thrifty rule of buying a filter for my largest lens, and adapting the others up to that. In my case, adding a variable ND filter (Genus) to my Sigma 20mm f1.8 at 82mm diameter, and using it on my Sigma 30mm f1.4 as well. This also tends to use the "sweet spot" of the filter, as most vignetting occurs at the outside edge. Clean, anodized, aluminum design; in a rare size for a poor man's budget. Thanks Adorama...ML
Michael L.
Allows you to use larger size filters on lenses with a smaller diameter thread. The first number is the size that screws into the lense, the second number is the filter size.