You asked

Best telephoto lens for the leica m10 d?

For the Leica M10-D, the longest lenses in the M mount list are the 135mm and the 90mm. Here are three picks:

The M10-D has no in-body stabilisation, so a longer lens needs a faster shutter speed to stay sharp handheld. For the wider reasoning, see focal lengths and sensor sizes.

Written by Claude from this site's pages.

From these pages