Is the laowa 10mm f 4 cookie hard to focus manually?

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From Laowa 10mm f/4 Cookie: Laowa 10mm f/4 Cookie: A prime lens by Laowa for APS-C cameras, 10mm f/4. A pancake ultra-wide for APS-C. Specs - Maker: Laowa - Focal length: 10mm (prime) - Maximum aperture: f/4 - Made for: APS-C sensors - Mounts: Sony E, Fujifilm X, Nikon Z, Canon RF - Stabilised: no - Autofocus: no, manual focus What it frames like - On APS-C (Sony E, Fujifilm X, Nikon Z): like 15mm on full frame; f/4 ...

From Laowa 15mm f/5 Cookie FF: Laowa 15mm f/5 Cookie FF: A prime lens by Laowa for Full frame cameras, 15mm f/5. A pancake ultra-wide for full frame.

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