I purchased this set of filters because I was happy with the same brand of filters for my 62mm-diameter lenses. I expected the 72mm filters to work equally well. While the CPL does work as advertised it's glass is very loose within the frame so it rattles around a lot when adjusting the CPL. A couple of times I was convinced that the glass was just going to fall out. I don't plan to return it because the filters do get the job done and they help to protect the lens itself. If the glass does fall out, at least I will not have spent a lot of money. I am going to save my pennies in the meantime so that I can buy a better quality CPL.(Update)The glass popped out which had me very upset until an extremely smart friend told me to screw in the ring around the glass tighter. I didn't even notice I could do that. The filter has been working well ever since. Based on this I am upping my rating to four stars.For those of you who might not know, the CPL will not darken the entire sky for some wide angle shots. It has nothing to do with the CPL but rather the amount of space covered in the shot. Some other technical person can do a better job of explaining in more detail. Here is an explanation I found on [.]"With an ultra-wide angle lens, one edge of your image frame might be nearly facing the sun, whereas the opposing edge might be facing 90° away from the sun. This means that you will be able to see the changing influence of your polarizer across a single photo, which is usually undesirable."
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