You asked
Is the zeiss biogon t 25mm f 2 8 zm good for street photography?
I think the 25mm is a good street lens. It's a fixed focal length on full frame, so you learn its view quickly and stop thinking about zooming. At f/2.8 it's bright enough for indoor and dusk scenes, and it's small enough to carry all day. The catch is manual focus only, so you'll need to pre-focus or get used to zone focusing.
My Street guide says a quiet, unobtrusive camera beats extra megapixels, so pair this lens with a compact Leica M body. If you want a wider or tighter view, I'd also look at the 28mm or 21mm versions. Whichever you choose, be open about what you're shooting and check the local rules for photographing people.
Written by Claude from this site's pages.