Is the voigtl nder color skopar 18mm f 2 8 aspherical hard to focus manually?

Here is what the site says about that.

From Voigtländer Color-Skopar 18mm f/2.8 Aspherical: Voigtländer Color-Skopar 18mm f/2.8 Aspherical: A prime lens by Voigtländer for APS-C cameras, 18mm f/2.8. Specs - Maker: Voigtländer - Focal length: 18mm (prime) - Maximum aperture: f/2.8 - Made for: APS-C sensors - Mounts: Fujifilm X - Stabilised: no - Autofocus: no, manual focus What it frames like - On APS-C (Fujifilm X): like 27mm on full frame; f/2.8 gives about the depth of field of f/4.2 there. Cameras it fits - Fujifilm X-E1: ...

From Voigtländer Color-Skopar 28mm f/2.8 Aspherical: Voigtländer Color-Skopar 28mm f/2.8 Aspherical: A prime lens by Voigtländer for Full frame cameras, 28mm f/2.8.

Quoted from this site's pages.