Fits perfectly

First of all: you should always install a UV filter just to protect the outer lens from dust, sand, grease, water and dirt, unless you only work indoors. At least I am one of those people who have a UV filter screwed onto every lens. This can be easily removed and cleaned if it gets dirty, and even replaced if necessary, but the lens cannot. The UV filter also improves the light and color representation when taking pictures outdoors, e.g. in the sky or in trees and leaves. The thread diameter of the lens is usually printed on the lens. About the product: Flawless glass, no inclusions or defects visible. High-quality metal design, practical grooved edge (fine). Pleasantly thin (5.3 mm with, 3.2 mm without thread) Multi-coated glass, 18 layers is a very good value. I have used UV filters from Gobe, Hoya and Rollei so far and would rate this product as very good and high quality. The price is also ok, you should budget 10-20 euros for a good UV filter.

Actually, you don't need a UV filter anymore these days, because camera manufacturers have been installing such a filter in front of the sensor for many years. However, there is one application in which a magnetic filter is useful and practical: If you have already fitted your lens(es) with a magnetic filter adapter, then a lens hood will generally no longer fit. However, this offers the best protection against, for example, accidental bumping. Without a gel, the front lens is exposed. And that's where this UV filter comes in, but a neutral glass filter would have done just as well. Now, filters generally have a negative effect on image quality, the only question is how much. This filter is very cheap at around 20 euros (67 mm) and I think the quality is OK. Flares (backlight that leads to unwanted reflections within the lens) seem to be much stronger to me, but it depends a lot on the lens anyway and a lens hood is always better than a better filter, unless you can avoid flares or even use them deliberately. There are two aspects of handling that bother me: the filter box is designed for much larger filters (I estimate 82 mm) and does not have a suitable recess for this 67 mm filter. This means that not only is the box much larger than necessary, but the filter also rattles around in it during transport. Solution: use your own filter bag, in the right size. The magnetic holding force between the filter and the lens adapter is weaker than that between the filter and the front cover. If you take the front cover off, this UV filter is always attached to it. For 20 euros, this filter is extremely cheap, technically/optically OK, but in practice it does show some small weaknesses. The fact that you basically get protection that can be removed quickly and that you don't have to spend a long time screwing on makes the filter still worth recommending.

Great price, I got it for the lens protector. The thickness is also good.

I took two UV filters with a diameter of 67 mm and 77 mm. Very thin rings designed with "toothed" areas to provide excellent grip when screwing in and out. The glass is well connected to the ring and has no play. Definitely neutral and imperceptible optical result. Viewed from the outside, the crystal reflects a strong violet hue. The "normal" protection of the lenses used is certainly effective.

This filter makes the colors of my photos more vivid and saturated. I would 100% recommend this filter.

Box contents:

- filter holder for 100 mm x 100 mm filter
- adapter ring 67 mm
- adapter ring 72 mm
- adapter ring 77 mm
- 82 mm adapter ring
- padded cardboard box for filter holder

The whole thing makes a very valuable impression overall.
The adapter rings are black anodized aluminum - they are well made, not sharp and the thread can be easily screwed onto the lenses.
In addition to the plastic filter cartridges, the filter holder is also made of black anodized aluminum. Here too, the treatment is excellent. Maybe the quality of the plastic inserts could be better, but this is already complaining at the highest level. The inserts fit all 100mm x 100mm filters with a thickness of 1mm to 2mm.
the packaging was impeccable; Adapters are individually packaged; The portafilter comes in a nice padded cardboard box.
Full points and recommendation for a perfect rectangular filter system at a significantly lower price than some other manufacturers.

For safe storage of three square filters 100 x 100 mm and a filter holder. The case seems sturdy and looks pretty good.