Is the leica summicron m 66mm f 2 good in low light?

The 66mm f/2 is a fast lens. That wide aperture lets in plenty of light, so it's a sensible choice for dim rooms, and it's a full frame lens, which is where a bigger sensor helps most in the dark. At the same f-number, full frame gathers roughly a stop more light than APS-C, which Sensor sizes explains.

I don't have low-light test results for this lens, so I won't claim more than the f/2 aperture and the sensor size tell us. It's manual focus only, so in dim light you'll be focusing by eye, and that takes practice.

If low light is your main concern, pair it with a body from its list, such as the Leica M11 or the Leica M10-R. For why fast primes are worth having, see Lenses.

Written by Claude from this site's pages.