Protection d'un summicron m de 28mm.

This is a comparison between the Hoya HDX Protector, the B+W Master 007 MRC Nano Clear and the K+F Concept Nano X-Series MC filters. Spoiler alert: All are good in their own way, it really comes down to your specific needs and preferences, which of them is best for you:- The Hoya HDX Protector -I am not a professional photographer, but subjectively the HDX offers the best optical quality of the three with absolutely no visible color shift, loss in contrast, etc. It also has the thinnest rim of the three, so vignetting should be no issue even with wide angle lenses. A particularity about the Hoya is the way the glass is held in place, there is a groove around the glass between the glass and the frame. This could be either good or bad. On the one hand it is easier to get dust and dirt off the rim of the glass, on the other hand it'll accumulate in that groove and it'll be very hard to ever get it out of that groove again. The threads on both sides of the filter are good, a lens cap or an ND-filter will fit. The filter itself comes without a filter storage box, just normal packaging.The deal breaker for me are the serrations on the very tip of the edge of the filter. They provide excellent grip to get the filter on and off, but are impedimental when the protector is used with an optical filter (ND, CIRP, Haze, etc.) on top of it, because the sides of the Hoya are completely smooth with no knurling at all. In consequence filters screwed on the Hoya do not come loose anymore. When you unscrew the optical filter, you also unscrew the HDX underneath it automatically, and then you have the problem, that the serrations bite into the optical filter, but your fingers cannot get a grip on the entirely smooth sides of the HDX to separate the filters again. This is cumbersome and forebodes, that one day with the help of some dirt and temperature shifts, the HDX and whatever filter was screwed on top of it will be stuck together forever. Another problem with the HDX is that it attracts dust like the plague.- The B+W Master 007 clear -The 007 comes by far with the best packaging. It includes a very nice leather pouch sized exactly for this particular filter and lined with suede. On the back it has a small slot for a tag to better organize your equipment. The pouch is almost perfect and I wished more manufacturers would provide pouches like this which can actually be used on the regular and with pleasure. The knurling on the B+W is only on the actual sides of the filter, not on the very tip of the edge like on the Hoya, so it is fine to use in combination with optical filters on top. The optical quality is also very good, but not just as good as the Hoya, because there seems to be a very slight yellowish tint to the pictures taken with it, although I am not perfectly sure about that. Among all three filters, the B+W definitely feels the sturdiest. It attracts a lot less dust than the Hoya, and the coating is also better than on the Hoya, because water runs off almost completely, which cannot be said of the Hoya.On the negative side the B+W has a ridiculously aggressive branding unmatched by any competitor I have seen. The sides of the filter only have knurling all around, but the front looks like an advertisement banner. Pointing your lens at anybody, especially close up, is pointing B+W ads at them in big golden letters, including "Made in Germany". Personally I find that a total no-go. The rim around the glass is also a lot broader than around the Hoya, maybe to fit the lettering. Whether that might be broad enough to cause vignetting with some wide angle lenses is speculative.- The K+F Nano X -Of all tree filters, the K+F is the lightest. The metal and threads feel very different from the Hoya and the B+W, and the finish is matte. Maybe because of that there is more resistance when screwing it on and off, on both sides, it is less smooth. The coating is the best of all three, water rolls off completely, at least as long as the filter is new. I cannot judge the long term performance yet. It also attracts slightly less dust than the B+W. Branding is very subtle on the side only, the rim is about as broad as on the B+W, maybe just a tiny bit more narrow. The knurling is only on the sides, not on the tip, and a lot more aggressive than on the B+W, but only in two spots, the rest of the side is smooth. These teeth also stand out farther, which for some lens hoods might be a problem, for mine it was not. Actually it makes it very comfortable to screw the filter on and off, and you can also hold it in place with two fingers when unscrewing only an optical filter from it. So it can stay on the lens basically forever.On the negative side K+F has the absolute worst filter case. It is universal for all filter sizes, which makes it far too big for most, and it is made of plastic that looks like it will break easily under pressure in a bag for example. The optical quality is still good, but compared to the other two the least good. Subjectively the K+F adds a slight blueish tint to pictures and takes out some contrast, which the other two do not. But, again, this is very hard to be sure of, because when taking pictures outside, light conditions change just a little bit every second. I did not make this a scientific test under controlled conditions.Final recommendations:If you are looking for the best optical quality, do not plan to use the lens protector with optical filters on top, and do not have a problem with dust, then definitely go for the Hoya.If you want the next best optical quality in a very sturdy frame with a great pouch, and do not mind being an unpaid PR worker for B+W, then go for the Master 007.If you want the least sensitivity to dust and water, combined with a very grippy and lightweight design, and do not mind sacrificing a little bit of optical quality, then go for the K+F.

The B+W packaging does not keep the filter clean. New, straight out of the box, was covered with dust and had residue around the edge. Not the old B+W that came spotless in a sealed crystal filter case. Verified authenticity on B+W website. So disappointing to see such a decline in what was once a top of the line filter.

This matches your Garmin Epix pro 51mm or Fenix pro 51mm watch bezel to prevent scratches. Goes on easily.I wear my watch daily while working out and doing household chores inside and outside the house; this helps avoid ugly scratches to the original bezel.Recommendation to the Company: The inner area of the bezel is somewhat sharp, It would be beneficial if the bezel was tapered down on the inside for a more smooth touch.