Olympus 12-40 vs Sigma 17-50

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kidcruz Regular Member • Posts: 154
Olympus 12-40 vs Sigma 17-50

Hi,

I have a Olympus 12-40, which I use for video on my g85. I was thinking to swop it for a Sigma 18-35 with a metabones or viltrox speed booster. However I stumbled across the 17-50, and videos/low light performance looked almost as impressive as the 18-35.

Will the extra stop of light from the speed booster (with the 17-50), be noticeable enough difference in comparison to my 12-40 lens?

Panasonic G85
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