Answer by lindes for What does "usable number" mean in lens specification?
I believe this is referring to the maximum number of filters you can screw onto the front of the lens before suffering from significant vignetting. Adding more filters, you get too "tall" of a stack,...
View ArticleWhat does "usable number" mean in lens specification?
I just got a new Canon EF50/1.8 II lens. Looking at the specs included with the camera there is a line that saysFilter Diameter / Usable Number 52 mm / 1What does "Usable Number" mean?
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