Is the olympus 9mm f 8 fisheye body cap lens hard to focus manually?

Here is what the site says about that.

From Olympus 9mm f/8 Fisheye Body Cap Lens: Olympus 9mm f/8 Fisheye Body Cap Lens: A prime lens by Olympus for Micro Four Thirds cameras, 9mm f/8. A fisheye as thin as a body cap, with a fixed f/8 aperture and manual focus. Specs - Maker: Olympus - Focal length: 9mm (prime) - Maximum aperture: f/8 - Made for: Micro Four Thirds sensors - Mounts: Micro Four Thirds - Stabilised: no - Autofocus: no, manual focus What it frames like - On Micro Four Thirds ...

From Olympus 15mm f/8 Body Cap Lens: Olympus 15mm f/8 Body Cap Lens: A prime lens by Olympus for Micro Four Thirds cameras, 15mm f/8. A lens as thin as a body cap, with a fixed f/8 aperture and a manual focus lever.

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