You asked

Is the zeiss biogon t 35mm f 2 zm hard to focus manually?

The site doesn't rate how hard this lens is to focus by hand, so I can't give you a verdict on that. What I can tell you is that the Zeiss Biogon T\* 35mm f/2 ZM is manual focus only, with no autofocus, so every shot is a hands-on focus job.

It's made for Leica M mount, and it fits a long list of Leica M bodies, including the Leica M10 and the Leica M11. If you're new to manual focus, try the lens in a shop before you buy, and check how it feels on the body you plan to use.

Written by Claude from this site's pages.

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