"I have been using K&F Concept filters for several months and have been very pleased with their quality. This set of a UV filter, circular polarizer and two lens caps is excellent quality and very reasonably priced. As far as optical quality goes, I can't find anything wrong with these. They are top notch and easily comparable in quality to Tiffen filters.

The filter frames are made of aluminum alloy, which is strong and lightweight. They screw on fairly smoothly, but are not quite as smooth as the heavier brass rings you get on more expensive filters. Brass is naturally a less "sticky" metal, but these aluminum frames work flawlessly, mainly because they have sections of milled grooves on each side that give your fingers a great grip when screwing the filters on and off. I usually rub a little finger grease over the threads every now and then, just to have a little lubrication.

The screw-on lens caps are beautifully made and provide excellent protection, but they will not replace my standard snap-on plastic lens cap for everyday photography use, as I find that screwing a lens cap on and off is too time consuming and cumbersome. Of course, the polarizer and UV filter can be used with any standard snap-on lens cap - you don't have to use the screw-on lens caps.

These filters come beautifully packaged in a foil-stamped, hinged cardboard gift box. Included is a K&F branded microfiber drawstring bag. They would make a great gift for a photographer, provided you know what size filter they use for their lenses.

These are excellent quality filters and well worth the price, so I highly recommend them."