Used this filter to protect my new 90mm summicron. It is coated and is indeed of very high quality. On par with my other Leica filters. For the price you cannot beat this

Compact, powerful and Leica quality. The extra add on magnifying lens is really handy. It can read the smallest engraving on the smallest coin.So you get an excellent monocular for distant viewing like sporting events, bird watching, etc and a super magnifying lens to pick out the smallest detail on anything.

I have been using this filter to protect my lens and it has done the job.

Say what you will about the Leica price premium but this is an amazing little monocular. I've been using it for about 6 months now and don't know how I ever lived without it. I'm a photographer and this fits nicely in my camera bag, to be used for spotting animals and people to approach and photograph. I also take it with me on extended mountain treks, where it is incredibly useful. The close-up lens is nice to have, but I find myself using it only infrequently, mostly because the case, where it is stored, is so bulky I tend to leave it home. It gets 4 stars instead of 5 due to the bulkiness of the case, which doesn't fit the lanyard, and factoring in price/value.But why the Leica? Because of the clarity and brightness of the image and the durability and build of the product. It's survived 4 foot falls onto dirt without damage. It's been inundated with rain and snow. I've let everybody and their uncle use the thing and it's still like new. The initial stiffness in the focus ring has loosened up. It's possible to shoot through the monocular using my Sony RX100M3 camera, or any smaller point-and-shoot. Just put the zoom on full and focus on infinity, then place the monocular over the lens. The results aren't spectacular, but it'll do as a long telephoto in a pinch.I look forward to decades of use of this investment, and eventually I'll pass it on to one of my kids.

For those looking for a front objective lens cover (which Leica should have provided!!!), the Leupold 20mm cover doesn't work. However, the Butler Creek 02 Eye Flip Open Scope Cover works excellently (1.225"). Try a couple different size rubberbands over the objective lens barrel to give it a snug fit and it won't budge, is watertight, and the rubberband can't be seen. Also it doesn't interfere with the focusing ring.

I typically don't use UV filters but I have some 70+ year old Leica lenses with delicate front elements I want to protect. I ordered this Urth Plus+ one because it claims to use German Schott glass and wasn't obscenely expensive for a piece of glass who's job is just to be invisible.I tested this filter on a Leica Summicron 50mm adapted to my Sony a7R II (42 MP). I did 1:1 comparisons locked down on a tripod with the filter on and off. I shot it at close, medium and infinity focus, every aperture from f/2 to f/16, brick walls, grey walls, high contrast, with the sun in frame, etc all pixel peeped at 200% blow ups on a calibrated monitor in a controlled environment.I can't find any differences in my photos with and without the filter. This UV filter is actually as invisible as one could hope for.

I purchased a Canon FD to Leica M adapter in order to get some more use out of my 17mm Canon lens. I’m pretty impressed with it so far. It seems considerably better quality than the cheap imported adapters, and not as expensive as a Novoflex. The lens hooks up solid and it feels solid on the camera body. I will most likely try some of their other adapters as necessary.

Just what I needed for the IR correction on my Leica M8. A good quality filter at a good price.