Comments about Heliopan Heliopan 62mm Slim Mount, Wide Angle Circular Polarizer Filter.:

Used with 18-250MM lens, shooting structures (homes mostly). I use it primarily to block out reflections in windows and produce more contrasting, richer colors, and also to protect the lens.

I'm impressed by the quality. Rings are factory marked with numbers, which is nice. Just testing it out on my LCD at home, I achieved nearly 100% polarization (screen almost entirely black).

This is the thinnest filter I could obtain, but it still vignettes at 18mm on my lens (not as bad as others I have tried though). There may be no solution but to get a step up ring and move to to a larger filter.

It also appeared to have been used, as there was quite a bit of grime on the edge of the glass and the ring appears to have been scratch-marked by the previous owner.

I would recommend this to a friend, but only if it were new and not used with a lens like mine. But as for the filter quality, it's top notch. Just be aware that even if the description claims to not vignette, it's no guarantee.