Hey guys, 24mm is the widest I have at the moment on FX, not including my fisheye - and I was thinking to get something a little wider for landscapes when I travel. I don't want to add too much weight or size to my kit which is curently (24,35,58,135.)
My budget is ~$600, manual focus is ok, will be tripod use mainly so doesn't need to be fast - mainly need good corner to corner sharpness stopped down and compatable with filters. Small and lighter, the better

So what are my options for full frame use?

So far I have found the Nikon Ais 20mm 3.5, the Nikon 20 2.8 AFD and the Voigtlander 20mm? What am I missing?

P.S. Doesn't have to be a prime - so if you know of a relatively, small, light UWA FX zoom for ~$600 that is good stopped down, I'd be interested in that too.

cheers