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Viltrox Speedbooster - Compatibility with my Lenses

Started Dec 16, 2018 | Discussions thread
sobrien
sobrien Senior Member • Posts: 1,756
Re: Viltrox speed booster lens compatible on m50

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.

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 sobrien's gear list:sobrien's gear list
Canon EOS R Canon EOS R5 Canon EF 85mm F1.8 USM Canon EF 135mm F2L USM Canon Extender EF 2x III +16 more
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