hmmm. I thought they still had itA bit big, larger than the 18-50 2.8.get a 20mm sigma .. just sort through the sample variations that
may occur. especially for a fast lens.
Slow but perhaps acceptable if it performs good at 3.5 and isanother lens that isn't that big that might work for you is the
tokina 17mm - small and compact but not as fast.
reasonably small. Can't find any dimensions for it as it doesn't
show up in their current line up:
http://www.tokinalens.com/products/tokina/index.html
there ya go..b&H still has it and the specs..
http://www.bhphotovideo.com/c/product/169414-REG/Tokina_ATX17AFPRON_Super_W_A_AF_17mm.html