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I purchased this item based on reviews on this site, and others. I really thought that for the price, I was getting a high quality item, since it is much more expensive than other 77mm filters. After attaching this to an expensive lens, I heard rattling in my camera bag. When I removed the filter, it came apart in 3 sections. While it is a quality item, not sure if this is a design flaw, or damaged. Had the filter shattered, it could have been disastrous! A shattered filter could have scratched my lens. A filter gives me a sense of security. This one did not. However, I am not giving up. I am returning this item for a replacement in the hopes that it will be exactly what has been described as a quality item. This review will be updated once I have received the return item, have used it, and am confident it meets my expectations.

I purchased two X2 67 mm UV lens in the past few months to protect my new and expensive Canon nano USM lenses, but since I just bought the Canon EF 100mm f/2.8L MACRO lens, I decided to get the X4 UV 67mm instead of the X2.

All I can say is WOW! You definitely get what you pay for! The X2 filters are very nice, but this is a giant step up.

Feels nice and strong, very sturdy. Has a little bit of weight, but thats to be expected from premium filters. You will not be disappointed and with a 25 year guarantee you cannot go wrong. I am very happy I spent the extra money for the X4.

From now on, all of my filters will be from Breakthrough.

UPDATE: Just purchased the 72mm X4 for my new Canon EF 70-200mm IS II USM lens. The best lenses need the best filter - the X4 is fantastic as always! After purchasing 2 X2 UV filters and 2 X4 UV filters I will keep coming back again and again!

UPDATE #2: Just purchased the 77mm X4 for my new Canon RF 24-105mm F/4L IS USM lens - fits perfectly as always and does not interfere with the lens or picture quality what so ever (either photo or video) - I am sure there will be an update 3 in the future :)

Installed on my Sony 24mm f/1.4, the image quality is not noticeably affected by this filter, which is what you want. It's basically a transparent lens cap for people like me who are prone to damaging front elements. The problem with this filter is the metal is a bit too beefy. It's great for taking it off, but it interferes with the lens hood, making it difficult to install. That's good, because sometimes filters can get stuck, but it's a hassle every time I put on/off the lens hood. I wouldn't buy this filter again for that reason.

These are some of the best filters out there. Even after shooting professionally for the past 12 years, I used to just use cheap filters since I considered them as disposable wear and tear items. UV filters are typically used as lens element protectors, meaning that if you bang the front of your lens against something by accident it will theoretically protect the front of the lens from major damage. I was convinced by a local shop owner to try these out, as they have several features that cheaper filters don't have. These filters feature brass rings painted black and are very easy to thread on and off thanks to the knurled design to enhance grip. The glass used I believe is Schott glass, which is optically clear and distortion free, as well as having little to no effect on color cast. The filter is also multi coated, and thanks to this proprietary coating, is far easier to wipe clean of finger prints, oils, and salt spray compared to other premium filters I have tried. This filter costs a bit more, but if you shoot outdoors a lot or are frustrated with not being able to wipe the lens clean quickly, totally worth it!

Just bought one of the 10-Stop filters.
With an exposure difference of 1/80 vs 20” (slightly more than 10 stops?) the results were nearly indistinguishable from each other.
Very sharp, no loss of contrast, and no decreeable difference in color cast.
When measured, there was a 0.1% -- 0.2% difference in color. But that could certainly be explained by slight lighting change in the room or being off by a pixel where metering.
I would whole heartedly suggest these filters to anyone looking to get some. I was surprised how good they were and the advertising claims were not over-hyped.

FYI,
I did buy one of those cheap $30 ND filter packs off Amazon a while back to play with.
I figured a color cast would be no big deal for what I want to do.
But not only was there a huge nearly unfixable color cast when stacking to get 10 stops, the loss of contrast and of sharpness was completely unacceptable.
I would say, for the price that using a single filter from this pack was mostly acceptable to get your toe in the water and see if you’d make use of more expensive filters.
Truly not useable for anything worthwhile.

I’ll do some better testing with these, and try to put up a comparison within a controlled studio environment. It is an amazing difference.

I bought this filter based on my experience with a Breakthrough Photography CPL, which is fabulous. This filter is for a new Leica 8-18 micro 4/3 lens. I was concerned that the filter might cause some flare on an extreme wide angle lens. The lens is nano coated to minimize flare, but so is the filter. So, I took the same shot with, and without the filter. The result surprised me - less flare with the filter. Breakthrough Photography is designing and manufacturing fabulous filters that cost less than other high-end filters and are made to the highest standards. I especially like the ring design that makes it very easy to grip and remove/attach the filter. A great company and I hope they continue to innovate.

I read all the reviews and looked at the YouTube videos and thought i would give it a try. So glad I did my homework and did not go for the other brands that are often recommended.
The moment you get it out the box it screams quality by it's weight and feel. Even the packaging looks great. The X4 UV features an ultra-slim double-threaded 3.2mm frame that prevents any vignetting. It still works with all my lens caps and adding filters on top.
The nano coating layer technology, called (nanotec) , stop dirt, water and other elements. It does genuinely stay so clean and even beads up in the rain.
The grip around the filter makes it easy to grip and unthread. Will definitely buy more filters by this company. Very impressed.