You asked
Laowa 10 18mm f 4 5 5 6 zoom vs laowa 8 16mm f 3 5 5 zoom cf?
Here is what the site says about that.
From Laowa 10-18mm f/4.5-5.6 Zoom: Laowa 10-18mm f/4.5-5.6 Zoom: A zoom lens by Laowa for Full frame cameras, 10-18mm f/4.5-5.6. A small ultra-wide zoom for full frame. Specs - Maker: Laowa - Focal length: 10-18mm (zoom) - Maximum aperture: f/4.5-5.6 (it gets darker as you zoom in) - Made for: Full frame sensors - Mounts: Sony E, Nikon Z, L-Mount - Stabilised: no - Autofocus: no, manual focus What it frames like - On full frame (Sony E, Nikon ...
From Laowa 8-16mm f/3.5-5 Zoom CF: Laowa 8-16mm f/3.5-5 Zoom CF: A zoom lens by Laowa for APS-C cameras, 8-16mm f/3.5-5. Specs - Maker: Laowa - Focal length: 8-16mm (zoom) - Maximum aperture: f/3.5-5 (it gets darker as you zoom in) - 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 12-24mm on full ...
Quoted from this site's pages.