Small, light UWA prime

[kaiser]

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

[kiwi]

I have the 20 2.8......i like it

[arthurking83]

I think Tamron made a very well respected 17mm prime years ago. It may only exist in Adaptall mount, but for a D700 this is not an issue.
From what I've read of it, it's very sharp.

Finding one tho may be a very difficult endeavour.

[kaiser]

Thanks Darren and AK. Also just stumbled across the newer Samyang 14mm 2.8...although it isn't exactly small and light - it is meant to be even sharper than the Zeiss 18mm which is saying something.