WANTED: 50mm SIGMA f1.4

Looking to go more into the portrait side of things.......

and ideally looking for one of these:

[link=Sigma 50mm F1.4 EX DG HSM Lens - Pentax Fit ]Sigma 50mm F1.4 EX DG HSM Lens - Pentax Fit [/link]

Ideally a swap with a cash adjustment either way for a

Sigma 120-400 f 4.5-5.6 in A1 condtion
or
Pentax k-x + twin kit lenses again in A1 condition with c.6000 shutter clicks.