Used on a Sony Alpha 7III (FE mount), this ND filter is superb. The finishes are very good, the notched indicators on the ring allow you to calculate the number of stops.
I mainly use it for videos, I didn't notice any “cross” effect even at max.
It's confirmed!

Fits my pentax k lenses and my alpha 7 ii camera

The lens adapter is very well made and has hardly any play as other adapters are reported to have. The tripod mount is fixed to the adapter, not interchangeable like the original, but this also brings better stability, so from my point of view, better than the original. Focusing and aperture control works perfectly.

Mounting Nikon lenses on the XT2 and this adapter works very well. No sacrificing quality as there is no glass, it is just a mock adapter. I've tried various Nikon G lenses and Zeiss ZF mount lenses and had no problems. The mount or lens doesn't play and it feels secure. As with most other adapters, there are no aperture markings at all, leaving you guessing with any lens that doesn't have manual aperture controls. At this price you really can't go wrong!

I bought this adapter for the Lumix G70 - to use the lenses of my Sony Alpha 58 (A). It works wonderfully! Also the manual adjustment of the aperture. What I don't like so much is that there is a circular groove below (contact between A-lens and adapter), the contact goes over the chip of the A-lens and could "easily" damage it. Maybe a production error.

The lens for the Sony Alpha 6000 is perfect for portraits. I use this lens almost exclusively. The price/performance ratio is absolutely right here!

The lens is among the best you can buy for Sony e-mount! This optic also performs very well in comparison to the much more expensive Zeiss lens. I bought it for the NEX-5. It was already very popular and often used. I'm now using it on the Alpha 6000 and I'm even more excited and satisfied because of the outstanding sharpness on the higher-resolution sensor. Sharpness = very good! Distortion = very low! Autofocus = very fast and very good (with hybrid autofocus of the a-6000) Anti-shake = very good and integrated! I have very often mounted this lens from the outset and make entire excursions exclusively with this lens. It simply has very good all-round properties! It's light, small and easy to take with you! The only small downside is the plastic sun visor, which is not that durable!

I bought this adapter for my new Alpha 7M2. I came from an old sony alpha 450 bought about 10 years ago and on which I mounted some Minolta lenses my father owned in an old analogue. What can I say, he does his job very well.
The body of the adapter is made entirely of metal.
Some notes: as has already been written, the AF obviously does not work and you will have to focus manually (which I do not mind).
Having switched to full-frame, my old fish-eye (made for APS-C), hooked to this adapter, initially showed horrible black borders. However, the sony alpha 7m2 has a setting just for this and allows you to shoot in APS-C mode.
The aperture ring is intuitive and easy to use.