You asked
Is the panasonic lumix s 14 28mm f 4 5 6 macro good on aps c?
On APS-C it works, but it's a full-frame lens being used in a crop, so you're getting a narrower view than its marking suggests. On an APS-C body it frames like a 21-42mm lens, which covers everyday wide shots, groups, and street scenes well. The f/4-5.6 aperture gives roughly the depth of field of f/6-8.4 there, so it's less good in dim light or when you want a soft background.
If you're shooting APS-C and want this range, the lens fits the Leica TL, Leica CL, Leica T (Typ 701) and Leica TL2. I'd pick the CL or TL2 for a compact, sensible pairing.
For the crop maths, see the focal length converter and the sensor sizes guide.
Written by Claude from this site's pages.