The price is great for this type of product.- engine diagnostics and repair

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It works just as a circular polarizer should, by twisting a ring, reflections can be easily eliminated. It also darkens blue skies and increases overall contrast and saturation. The intensity of the effect can be adjusted too. - www.facebook.com/SprayFoamProsLafayette/

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I bought this today as an alternative to more expensive polarizers. Dumpster Rental figured, yeah, it's not going to perform as well, but it should be good enough. I was wrong.

The problems start before you even put this on your lens. That is if you can get it on your lens. The threading sucks, and even at its tightest, mine never screws on flush with the lens barrel and always feels loose.

It works

Can't use with through the lens phase detecting focus systems, i.e., all SLR's.

Works great on contrast based focusing cameras like the Lumix LX-7.
For the other reviews stating it did not work as they had blurry photos that is because they did not know you can not use a circular polarizing filter and still have auto-focus work.

Inexpensive, uses glass, threads fit the camera,

Created significant focusing problems.

Purchased a Sunpak CP filter while on a trip to Boston - My camera a Fuji HS10 Is pretty new so I didn't have a chance to buy one before. I experienced the focus problem from the beginning and found it to be quite erratic but usually occurred at the max telephoto position - 30X. Played around with it at various lens zooms and lighting conditions and even found that at short distances and low zoom it sometimes rendered the auto-focus unusable.

I was very disappointed and brought it back to the shop I Bought it at and found that they had a no returns policy. I pleaded with them and the manager tried it out and he did not find any problem (sheesh!), but was willing to refund me the price less a 20% "restocking fee". He used all types of excuses as to why my comparative photos were out of focus. I guess I should be grateful since he didn't have to do that (it was the next day after I bought it by the way.)

I was gratified to see that I was not the only one with this problem and when I found this forum I decided to join up.

I guess the lessons learned here are
1 - check the returns policy,
2- check online and
3 - try before you buy (if possible)

Customer Service

Mmmmm- ok I guess but could have been better.

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Hoya CP - was superb.with my Nikon 8800

The price is great for this type of product.

The design of the circular polarizer makes it difficult to take off or put back on.

Despite what many others have written about this product, I believe this circular polarizer is about as good as you can get for this item's price range. Also, I believe that much of the negative criticism over this product is due to the fact that many simply don't understand how a circular polarizer works.

For those who do, there are definitely better polarizers out there, but for this price, it simply cant be beat. Your polarizer is bound to get scratched and worn, so unless you are trying to sell your photography, or polarization is very, very important to you, you shouldn't spend a whole lot of money on your polarizer.

For more specific product information, I bought a 58mm Sunpak circular polarizer for a 70-300mm Canon lens. The polarizer seems to perform adequately at all ranges, even if the level of polarization is not as great as I would prefer.

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I have not used any other polarizers before, but have researched them extensively.

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Useless. Causes severe blurred images.

I purchased the 72mm circular polarizer from Best Buy for my Nikon 18-200mm lens. I took a few shots with the filter in place. The images came out blurred to the extent the photos were useless. Removed the filter and all was sharp again. Don't waste your money. I did, and now I seriously regret it.

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Every photo I took with my new uv filer had green streaks running through out the image? Not sure what caused this but as soon as I took it off, all was good. Good thing I had my lap top with me to view photos otherwise my entire shoot would have been ruined.

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blurry pictures

terrible!
I did not expect that this polafilter could blur my pictures so bad.
It is absolutely useless.
The picture quality becomes so poor that it seems that the camera doesn't focus correctly

Customer Service

I have sent a complaint, but no answer yet after a week

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skylight filter

horrible filter - i got a new lens and when i shoot my first pictures with this polarizer on, i thought the lens is brocken, the images where unsharp and blurry, thought the polarizer worked fine by itself. However, the lens wasn;t broken, as i found out after removing the polarizer...