A:Answer The type of camera and the lens focal length (i.e.: "55-250," etc.) really doesn't matter when talking about filter sizes. The way to determine what size filter you need for your lens is to look at the front face of the lens, at the thin rim around the lens itself. You'll see several groups of symbols, letters, and numbers. One of those is the one you need. It has a figure that looks like a zero with a vertical line through it, followed by a number (such as 58, or 52, etc., etc.). That number is the physical diameter in millimeters of the filter you need. One side of the filter will have as set of very fine threads that will allow it to screw into the fine set of threads that are on the front face of your lens.
