X4 CPL 58mm Circular Polarizer Filter - Schott B270 - MRC16 - Nano Coating - Weather Sealed - 25 Year Support by Breakthrough Photography

Quality filter. No problems with the threads. Made of brass, so very sturdy.

So far very impressed. As advertised, color neutral, at least within bounds of what you might change in Lightroom anyhow. What I really like is the mounting threads. So smooth, and then the filter spins freely. Nice finish, a little pop of color. Just a well made product. Buy once cry once if you want quality.

Great polarizer!(For those who thinks it doesn’t work, it doesn’t reduce light as much as cheaper ones, so it *appears* to be “not working”. Try standing in front of a mirror with the polarizer and flip it around a few times and you will see in the mirror that it is blocking light just fine.)Like other polarizers, it is quite thin, and not trivial to get back off your lens unless you use a rubber band around it to get a good grip. Before you say it, yes, I agree, they should provide that with the filter (and probably with GND filters too).Check the results with and without the polarizer in water, sun at a cross-angle to you, snow, and so on. You will be very pleased with the results!

So this is a 2 for 1 filter its a circular polarization and a true ND 6 stop filter so no more stacking filters or having filters stick together or not working right ..so for the price i think its justify i used it on a tamron 10-24mm wide angle lens with no issue.. you can do what i did buy it try it for a week then see if it worth it or send it back and get your money back .. and i ended up keeping it... Now they are markings or symbols around this filter beside the normal triangle mark this is a guide for you so when you are using this horizontal and turn the polarizer to get the effect you wont look at one of the marks.. just incase you wont to shoot vertical or move to another spot to reframed your shoot you can use this to get the filter back to that spot that you had it before

Wow! I guess I got suckered by all the positive reviews.As one reviewer noted, however, this is not a CPL filter. It is a straight-up linear polarizing filter. This was verified with both the mirror test and by looking at an LCD screen. I double-checked that I'm not making a mistake with one of my Hoya EVO CPL filters, and it passed both tests while the Breakthrough X4 CPL filter failed both tests. Hard to give it credit for being only 1-stop darker (verified) when it's not a CPL.Beyond that, the construction is nice, and it rotates smoothly. The markings are somewhat useless/confusing, and they could have some up with something better than hieroglyphics. In the end, I just used my finger position and rotated it 90 degrees.The red ring also seriously looks like anodized aluminum. I found it AWFUL to remove the filter, and it jammed badly against the Breakthrough X4 UV. Adding/removing a CPL easily is a must when changing light conditions. My Hoya EVO CPL filters are such a breeze to remove (and are slightly thinner). This is because the tiny ridges on the Breakthrough mount ring are basically flush with the turn ring. Ironically, I found myself loosening the filter while turning the filter clockwise (as I'm looking). The Hoya has the turning ring at a slightly smaller diameter, so it's easy to feel which is which and also easier to grip the mounting ring when you need to. Lessons to be learned here. I rotate or install/remove my Hoyas effortlessly without even thinking. This Breakthrough takes 5X longer, much more concentration, and binds/jams so bad that I just leave it until I could get inside and set it down. Ease-of-use sucks.The packaging seemed a waste, too, although the filter arrived clean. There's weird stickers here and there, and some of them coming off and stuck to other things. Not impressed with the packaging but not that I really care. I would have preferred a more practical travel case like the old school clear twist-lock ones.I might try one of the Chinese magnetic filters (and pray the optics are not awful) or just go back to Hoya EVO or HD3.