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How to determine the filter size
Which size camera filter (or lens cap or conversion lens) is needed for my camera?
Most camera models print the filter diameter on the lens right where the lens cap attaches. It's usually indicated by a circle with a slash through it followed by the size in mm.
For example, If there is a circle with a slash through it followed by the number 37, then the size of your filter thread is 37mm. In this case, you can use any 37mm filter, lens cap, or conversion lens.
The popular sizes are 25, 27, 28, 30, 37, 40.5, 43, 46, 49, 52, 55, 58, 62, 67, 72, 77, 82, 86, and 95mm.
If you can't find any writing on the lens area, check your camera's manual to verify the size of the filter thread.