You asked
Zeiss planar t 50mm f 1 4 vs zeiss milvus 50mm f 1 4?
Honestly, the two pages list the same specs: 50mm, f/1.4, made for full frame, Canon EF and Nikon F mounts, manual focus, no stabilisation. The site doesn't cover how they differ in optics, build, or price, so I can't tell you which one is better. If you want to decide, check the price and build on a shop listing or review.
Either one works on the same bodies. On full frame, both frame as a standard 50mm. If you shoot a Canon or Nikon APS-C camera, both frame like roughly 75 to 80mm. Good full-frame pairings are the Canon EOS 6D Mark II and the Nikon D750. For a crop body, try the Canon EOS 80D or the Nikon D7500.
If you're weighing a prime against a zoom, the Lenses guide explains the trade-off.
Written by Claude from this site's pages.