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| p.1 #2 · Circular polarizing filters |
There are many threads and I'm sure you'll get better replies soon. But...
Overall, technically all filters will have some effect on image quality. The better brands affect it less. For polarizer, the light transmission (or blocking thereof) may not be even. Generally, the minimum acceptable brands are the multicoated Hoyas or that M brand I can't of the name, then the german companies are best but cost the most. Always go for multicoated