You asked
Is the samyang af 14 24mm f 2 8 good on aps c?
Here is what the site says about that.
From Samyang AF 14-24mm f/2.8: Samyang AF 14-24mm f/2.8: A zoom lens by Samyang for Full frame cameras, 14-24mm f/2.8. A compact ultra-wide zoom co-developed with Schneider-Kreuznach, about 440 grams. Specs - Maker: Samyang - Focal length: 14-24mm (zoom) - Maximum aperture: f/2.8 - Made for: Full frame sensors - Mounts: Sony E, L-Mount - Stabilised: no - Autofocus: yes What it frames like - On full frame (Sony E, L-Mount): as marked, 14-24mm. - On APS-C (Sony E, ...
From Lenses: Focal length: Focal length sets how much of the scene you see. In full-frame terms: - 14-24mm, ultra-wide: interiors, big landscapes, dramatic perspective. - 24-35mm, wide: travel, street, environmental portraits. - 50mm, standard: close to how we see; good for almost anything. - 85-135mm, short telephoto: portraits, details. - 200mm and beyond, telephoto: wildlife, sport, distant landscapes. On APS-C, divide these by about 1.5 to get the lens you need; on Micro ...
Quoted from this site's pages.