Originally posted by UncleVanya I thought I would post here and ask for your - take everywhere Prime lens that you could be "Mostly Happy" using as your "only" lens.
Taking OP's question seriously, not just asking for a favorite lens,
I would have to say it's the Zeiss ZK 50/2 Makro-Planar.
It does all the usual nifty-fifty jobs, on APS-C and FF,
but then at f/2, where it's still sharp, it's also a low-light demon,
and at 1:2 it does almost everything you'd expect of a macro lens.
It doesn't do wide-angle directly,
but the distortion is low enough to make stitching a reasonable proposition.
None of my other primes is that versatile.