Is the 7artisans 10mm f 2 8 fisheye ii hard to focus manually?

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From 7Artisans 10mm f/2.8 Fisheye II: 7Artisans 10mm f/2.8 Fisheye II: A prime lens by 7Artisans for Full frame cameras, 10mm f/2.8. Specs - Maker: 7Artisans - Focal length: 10mm (prime) - Maximum aperture: f/2.8 - Made for: Full frame sensors - Mounts: Sony E, Nikon Z, Canon RF, L-Mount - Stabilised: no - Autofocus: no, manual focus What it frames like - On full frame (Sony E, Nikon Z, Canon RF, L-Mount): as marked, 10mm. - On APS-C (Sony E, ...

From 7Artisans 10mm f/2.8 Fisheye: 7Artisans 10mm f/2.8 Fisheye: A prime lens by 7Artisans for Full frame cameras, 10mm f/2.8.

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