Speed Booster Sigma 150-600mm

Started 9 months ago | Discussions thread
nnowak Veteran Member • Posts: 7,385
Re: Speed Booster Sigma 150-600mm

Aussie Coop wrote:

Has anyone used the Sigma 150-600 Contemporary on an Eos M with the Viltrox 0.71 Speed booster ?

I read there was a vignette and Im trying to find out how much and what people thought?

The M6 is a secondary camera and Im usually using the Sigma on my EosR but was thinking the boost in light would come in handy.

Puting a speedbooster on the Sigma 150-600mm f/5-6.3 creates a 106-426mm f/3.5-4.5 lens. When you mount this combo on an M series camera it is equivalent to 170-682mm f/5.6-7.1 on full frame.  You are basically right back where you started with this lens on your R, but with the additional image degradation caused by the speedbooster.

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