Pentax ZX-50 filter size?
I have a Pentax ZX-50 SLR and I want to buy a Polarizer Filter for it, but I don't know what size would fit the 28-90mm lens that came with it?
Anyone knows! Let me know!
Thanks 
I know the symbol for the filter size (that would be on the lens for filter size) but there is none.
*Circle with the slash*
That information should be on the front of the lens and shown by a circle with a slash in it followed by a number.
If it's not on the lens…ugh. First of all, are there even threads to mount a filter to it? (I'm assuming there are, since you're asking, but I thought I'd check.)
If you've got a GOOD camera store available to you (translation: not Best Buy), they should have a variety of filters that are usually sold in an easily re-sealable pouch so that you can try different ones on for size. Start with a 55mm (I'm going with what fits my old 28-90mm).
If you have a micrometer, you can measure the inside diameter of the lens end and add 2-3 mm.
Alternatively, I've had great luck with asking questions directly to Pentax and getting a reasonably quick response.