M50 Issues with Sigma Fast Primes (85mm f/1.4, 50mm f/1.4)

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Chamith New Member • Posts: 2
M50 Issues with Sigma Fast Primes (85mm f/1.4, 50mm f/1.4)
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Has anyone used M50 with a Sigma Prime such as 85mm f/1.4 or 50mm f/1.4?

I'm experiencing few problems with this combination both with the Canon EF-EFM mount as well as Viltrox Speedbosster. It leads me to the conclusion that it's not the adapter.

My Sigma fast primes are not the art series ones, but from the previous generation. However, they work perfectly fine with the original EOS M and the EOS M100 with both these adapters.

However, with M50, it gives multiple problems as I describe below.

Heavy vignetting:

With firmware v 1.0.1 it had this problem in 9 out of 10 shots. However with the v 1.0.2 upgrade, the occurrence is reduced to 1 - 2 out of 10.

Heavy Vignetting at the edges and at the center.

Under Exposure Issues:

When it does not have the vignetting issue, it underexposes the image regardless of the metering mode. Usually it is 3 or more stops under.

Has someone experienced something similar?

Thanks,

Chamith

 Chamith's gear list:Chamith's gear list
Canon EOS 7D Canon EOS M Canon EOS M100 Canon EOS M50 Sigma 50mm F1.4 EX DG HSM +16 more
Canon EOS M50 (EOS Kiss M) Sigma 50mm F1.4 EX DG HSM Sigma 85mm F1.4 EX DG HSM
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