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Viltrox Speedbooster - Compatibility with my Lenses

Started Dec 16, 2018 | Discussions thread
alvingo Regular Member • Posts: 107
Re: Viltrox speed booster lens compatible on m50
1

sobrien wrote:

sobrien wrote:

alvingo wrote:

Getting a speed booster for my m50

Has anyone tried sigma 35 art f1.4, canon 135 f2.0 and 70-200 f4 is ii

I've got one in the post and the first two lenses you mention will be amongst the first that I test out.

I found the autofocus of the 135L using the regular Canon EF-EF-M adapter was only ok with my M50. If the focus was way off it would struggle to find focus. I had to manually bring it close first and then AF would be fine. Bit of a funny one. I'll post back here anyway as soon as I can confirm how they work.

So my speedbooster arrived this afternoon.

Vignetting is pretty bad, but not totally unusable, for both the Sigma 35 Art and 135L. No edits have been done to the images below - simple conversions from raw using Lightroom (first two) and DXO (second three).

Centre sharpness seems pretty good though.

AF on 135L suffers from the same issue - if it is far out to focus to begin with it will not hit focus, you have to manually get it close first and then it will AF just fine.

It just arrive today too. did you update it? Here is my photos for sigma at 1.0, canon 70-200 f4 at f2.8 and Canon 135 at f1.4 and canon 40mm at f2.0. Didn't have prob with focus in all of them. Shot all in jpeg.

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