The filter gives a decent picture and for the money it's not bad. Unfortunately it's not possible to use autofocus at longer distances and I've been unable to get it off several times even though I didn't screw it all the way in.
14/05/2021
Very good polarizing filter for me, use it on Sigma 10-20mm 3.5 Ex for Nikon!! So far no reflections or loss of sharpness! Of course you lose 1-2 light levels because the filter glass is darker. But that's normal. Example photos: 1. 20mm with filter, 2. without filter, 3. 10mm with filter, you have to be careful because the full power of the lens is coming!! With a 10mm filter, always turn it back a bit, because the angle to the sun always causes barrel-shaped blue coloring! But not because of the filter! Is wide angle (physically) due, even with very expensive polarizing filters! Great value for money, of course!!, Use the filter in landscape photography!! Otherwise without!!
22/03/2021
The filter does what it should. However, the polarization effect is not particularly strong and the filter is very difficult to remove from the lens because it is very narrow and difficult to grip.
07/03/2021
This polarizing filter works excellently on my Sigma 24-105 F/4 on a Canon EOS 6D Mark II: Clear and haze-free landscape photos (if the sun is right, of course). For me, it is clearly the best value for money with very good imaging performance.
11/02/2021