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I have had K&F Concepts variable ND and CPL filters for a while, bought them because the price was right. I haven't had any issues thus far. note, they cannot be used in conjunction with lens hoods or caps (I think that's normal though).Picture is worth a thousand words though, so here are some examples. No weird artifacts in the photo and the polarizing effect is evident.Before CPL:[ATTACH=full]47588[/ATTACH]After:[ATTACH=full]47589[/ATTACH]Another example:Before CPL:[ATTACH=full]47590[/ATTACH]After:[ATTACH=full]47591[/ATTACH]The differences are there, but subtle. There is also a slight change to color cast, but I don't have the experience to say whether that's normal or not.
I have had K&F Concepts variable ND and CPL filters for a while, bought them because the price was right. I haven't had any issues thus far. note, they cannot be used in conjunction with lens hoods or caps (I think that's normal though).
Picture is worth a thousand words though, so here are some examples. No weird artifacts in the photo and the polarizing effect is evident.
Before CPL:
[ATTACH=full]47588[/ATTACH]
After:
[ATTACH=full]47589[/ATTACH]
Another example:
[ATTACH=full]47590[/ATTACH]
[ATTACH=full]47591[/ATTACH]
The differences are there, but subtle. There is also a slight change to color cast, but I don't have the experience to say whether that's normal or not.
