Suggest me a 24mm fast prime lens(f/2 or lower) for my Sony Nex 3NL camera. Sony Nex has a APS-C sized sensor with crop factor of 1.5 and I am looking for effective focal length of 35 mm. My budget is $ 350. Any third party or legacy lens(with adapter) available under $350? P.S. : I may also consider slightly wider lens if nothing is available at 24mm focal length.