domestic filters, including the starlight in the early years (now we only need to make film and television equipment), nature, green leaves, Tianya and Lushi, are actually not too different. Personally, I think Lu's workmanship is more detailed.

There is still a certain gap between domestic filters and imported filters. The gap on optical glass is not very big, but the evaporation process of antireflection film is still a lot worse. There is still a certain gap between the transparency of the filter and the imported brand.

I don't recommend using a UV mirror for digital cameras. The photosensitive characteristics of CCD/CMOS are different from those of film, and this knowledge needs to be updated. However, most "photographers" have been popularizing digital for so many years now, and their knowledge has not been synchronized, so it can be seen that they bought a camera with a UV mirror first.

if you are worried about the lens falling dust and bumping, it is cheap and good to buy a protective mirror (the light transmittance is higher than UV), so you must buy a multilayer coating, or you might as well not use it.

Due to different structures, polarizers are generally thicker than other filters.

So it is technically difficult to make its double-layer structure thin.

so the thin polarizer will be more expensive.

then why make it thin? Just to look good.

Because polarizers are generally thicker, it is possible that when using a wide-angle lens, the edge of the filter will slightly block the light and form a dark angle. The front edge of the thin polarizer is less prominent, so the possibility of blocking light is much less.

All you have to do is take a camera when you buy a polarizer, install it and try the wide-angle end to see if there is shading.

there is no need to buy a thin one.

adapters, especially those made in China, have different diameters.

theoretically, the bigger the better.

because the larger the aperture, the less light can be blocked by the filter edge.

however, the larger the aperture, the higher the purchase cost of the filter.