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A great (and a lot cheaper) alternative to the Metabones Speedbooster. The manufacturing quality of the product is high and it works well... One thing you need to be aware of however is, that this adapter is not set up correctly as delivered and infinity focus will be waaaaaaay off. You will need to adjust the optics and test it properly before using in anger but there are some YouTube videos that show you how to do this.
Verified purchase: Yes | Condition: New
I was a taking a bit of a gamble purchasing the Viltrox speedbooster having seen the price of the much more expensive and well known competitor. So long as you're prepared to be a bit patient for the focus to lock on and don't expect it to be as quick as a proptietory manufacturere's lens, then you shouldn't be too disappointed. If you're intending to shoot sports or wildlife, then you can I would save up for a proptietory lens. I simply wanted to be able to make use of my Canon 70-200 2.8L lens for the occasional shoot, in not too demanding situations, until I can afford to buy a Panasonic 35-100 f2.8. I found no problems with the sharpness of the images but I would be inclined to use manual focus and the focus peaking for critical sharpness. Great value for money.
Verified purchase: Yes | Condition: New
Delivery from UK to Scandinavia was a lot faster than I expected! Adapter works perfectly with the Sigma 18-35, really tight fit, but I wish the adapter would attach just a bit more securely to my GH5. Now it locks to the camera body with almost zero effort, and after the "click" there's just a bit of movement, but apparently according to Viltrox this falls inside the quality control standards. Works fine though, AF also works. Good image quality.
Verified purchase: Yes | Condition: New
I spent 2 months to decide to get the more expensive brand and finally got the viltrox for my pocket 4k and iam very happy. I didn't need to twist the glass to get infinity focus it worked out of the box for me. I have aputure control out of box just no autofocus for black magic camera but in cinema filming we don't need that. I was scared of its flaw where at the lowest aputure the image becomes soft and unusable however for me at f1.2 sigma yes it's soft but I could still use it if Iam desperate but at f.1.8 it really is quite sharp and bright enough for me. Build quality is really good overall Iam very satisfied with this. I saved about £600 which I could use for another lens.
Verified purchase: Yes | Condition: New
Works great with my Gh4 and rokinon lenses. I did have to turn the optical element to achieve infinite focus, but that was very easy to do and now it works. I tried to use autofocus on a 50mm f1.8 but was not able to get it to work properly, it just kept hunting back and forth, haven't tried it with any other lens with autofocus though so it might work better with other ones.
Verified purchase: Yes | Condition: New