[Yes] I did a lot of research as to what I should get adapter/lens wise for my R5c. This adapter turned out to be the perfect one! I can use great existing EF cinema lenses with my R5c, while also making up for the fact that the R5c has no internal ND with the drop in VND included with the adapter. I also love the PL mount style locking ring (I've never seen one like this in EF before!!), as it makes it quick and easy to swap lenses, and it ensures an absolutely solid connection. It can take some getting used to, particularly for those used to photography style mounts. But it's definitely a solidly built, high quality and very functional adapter. The VND filter apparently has better performance than the one in the Canon ef-rf filter adapter. And you can get a ton of third party options for more drop in filters!

[Yes] This lens is built like a tank. Its solid, the focus pull is smooth, and it gives you a crisp image even wide open. I can't wait for them to release a 24mm.

[Yes] I love this adapter. Works much better than I even expected.
Auto Focus works great, even didn't see the differences between original Sony lenses and Canon Lenses with this adapter (using Canon 24-105 L)

[Yes] I just used it for the first time yesterday. I put my Canon 70-200 f4 with IS on a Sony a7s ii. It worked perfectly. I was able to increase the speed to 2.8, and the IS worked just fine. It looks to be built well, and works exactly as I'd hoped. I'll update this review if my opinion changes.

[Yes] Just received the Vello lens adapter and mounted a Canon�EF 100-400mm f/4.5-5.6L IS II USM lens to a Sony A6300.� As a semi-professional Canon photographer, I am really impressed with the quality and clarity of the initial pictures.� Focusing was quick and accurate.� Next camera to test it on is my Hasselblad� Lunar. More to come!

[Sony E] Fantastic! It works just like other more expensive brands but is cheaper. I also got it on deal day and it was only $50 more than the regular non accelerated version. Perfect!!!!

[0.535 lb] Works well with my Canon EF 75-300mm lens on my Sony A 7II camera. Manual focus only

[0.535 lb] I brought this adapter to use it only my Sony A6500, mounted sigma 18-35mm(vignetting seen at 18mm, but starting at 24mm it doesn't appear) - Please note that AF doesn't work on this lens as it's not compatible, but you can control the aperture settings from the camera. Works perfectly fine with other lenses which were tested ex: EF 50mm f1.8 just works perfectly fine. This adapter is worth the money as it boosts out the performance from a cheap lens to a high end lens. AF will not be great in movie/video recordings but for Photos it's fine not great, but for the price point it provides almost all of the things with that EXTRA stop of light. I'm in love with this adapter. Will recommend this to friends.

[0.535 lb] I bought the Viltrox EF-NEX IV mount adapter to match the classic Canon 400mm f/5.6L wildlife lens to my Sony a6600 APS-C camera. The goal was to combine the autofocus of the lens with in-camera stabilization. This combination produces a focal length equivalent to 600mm on full frame at an affordable price tag. The stabilization is essential for hand-held photos (leaning against a stable object, such as a tree or car).

After playing with various camera settings, I found one that was successful: AF-A, Silent Shooting, Electronic Front Shutter OFF (together with CDAF on the adapter). The attached example shows the front range of the Rocky Mountains from 25 miles away.

[Sony E] The 50mm is out!