>>4440382Cheap shit CPLs will make a smeary mess of basically any lens that isn't a wide angle (and even then it won't be the best). Don't buy the $5 amazon CPL for instance. I find the X-series (not the K-series) K&F filters are practically free of any IQ robbing bullshit and they're like $30-40 USD. Colour casts are inevitable, and different brands have stronger or weaker effects, but generally anything within $40-150 should perform rather similarly. There are also versions that claim higher transmittance that'll cost you extra but that's not super necessary.
Buy a semi-decent one in a single size that'll fit your largest diameter lens, then buy cheap step-down rings for any other lenses you'd want to use it on. I chose 67mm and it's painless and inexpensive.
