You asked
What are the alternatives to the viltrox af 25mm f 1 7 air?
The closest alternatives I can point you to are the other two Viltrox AF Air primes for APS-C, both at f/1.7. The Viltrox AF 35mm f/1.7 Air is a step wider on framing, and the Viltrox AF 56mm f/1.7 Air is a step longer, which suits portraits. If you want to keep the same 25mm focal length, the 25mm page lists which cameras it fits, so check that first.
I haven't written up the 35mm and 56mm in as much detail, so compare their specs on their pages before you buy. For other makers, the third-party lenses guide explains Sigma, Tamron and Samyang options. Check that your camera's brand allows third-party autofocus lenses before you go that route.
Written by Claude from this site's pages.