You asked
What is the zeiss batis 135mm f 2 8 good for?
The Zeiss Batis 135mm f/2.8 is mainly a portrait lens. It's light and stabilised, and at 135mm on full frame it lets you stand back from your subject, which flatters faces and makes tight headshots easy. The f/2.8 aperture gives you good background blur outdoors. It's also useful for details, where you want to isolate a small subject.
It's made for Sony E mount and full frame bodies, and it fits the APS-C Sony cameras too. There it frames like about 202mm, with roughly the depth of field of f/4.2. If you mostly shoot people, it's a strong choice. For more on why longer lenses suit portraits, see Portraits, or browse the Sony E mount lenses.
Written by Claude from this site's pages.