hey guys i only have my alfa350 ive just got a new flash for it its an AF58 and ive been geting asked to do alot of portret photography as of late.

ive pritty much just got the standed twin lens kit. so with the new flash i was thinking i should upgrade to a good lens to get some verry shap imiges for the people.

i was wondering what sugestions yas might recomend for the sony. for the portret work should i be looking at geting a low F-stop like a 18mm to 50mm F.1.8 or get a fixed 55mm macro or some thing???