You asked

Is the sigma 85mm f 1 4 dg dn art good in low light?

The Sigma 85mm f/1.4 DG DN Art is a good choice for low light. Its f/1.4 maximum aperture lets in far more light than a kit zoom, which is exactly what you want indoors, at dusk, or at events. On a full frame body it frames as a true 85mm, and it's made for Sony E and L-Mount.

It isn't stabilised, so in dim rooms keep your shutter speed up or lean on a steady surface. As the sensor guide says, full frame is the right call for low light and shallow-depth portraits, and a fast prime like this is a big part of why. If you want to see how primes compare with zooms, check primes or zooms.

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