You asked

Is the 7artisans m 28mm f 1 4 hard to focus manually?

The site doesn't say how hard this lens is to focus. What I can confirm is that the 7Artisans M 28mm f/1.4 is manual focus only, with no autofocus, so you'll be setting the focus yourself every time. It's a Leica M mount lens for full frame bodies, and it fits models from the Leica M10 to the Leica M11.

For a sense of what manual focus involves, the Lenses guide explains why old manual lenses are a fun way to shoot without autofocus. If you're deciding whether a fixed 28mm suits how you shoot, the Street guide covers what that focal length asks of you. Handling it in a shop is the best test.

Written by Claude from this site's pages.

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