Originally posted by Urnamaster13 In what way will the DFA 50 be better over 55 1.4 ? Just curious as i am also considering buying a portrait lens to go with k3 mark 3. The 85 mm is way too heavy
The "F" in "D FA" tells you that it's made for a full-frame camera, so to cast that bigger image circle it's necessarily bigger and heavier, and quite a bit more expensive than the DA* 55 1.4 which is designed for APS-C cameras.
The D FA* 50 is designed to be used as a 50 on a full-frame camera, as a sort of general purpose lens, while the DA* 55 seems to be intended as a portrait lens, since its 55 mm focal length equates to 82.5 mm when used on an APS-C camera. On full-frame, 85 mm is favoured as a portrait lens, for the combination of angle and typical shooting distance. The 55 seems be designed to do the same thing on crop-frame cameras like the K-3 III.