What's the difference between DA and FA of Pentax lens?

Da is a digital half beat. Fa is a shot, but it is a title.

DA is Pentax's APS-C, that is, half-frame lens, digital lens, and FA lens is from Quan Huafu. Moreover, the FA heads of Pentax are all old people in the Pentax film era, and there is no digital optimization. At present, Pentax's Quan Huafu digital lens is DFA, like DFA24-70 just released last year. However, Pentax only launched the first Quan Huafu digital SLR K 1 last year or the year before, so there was no digital Quan Huafu earlier.

In addition, the da is not all semi-projective, and many da heads can also be used by Quan Huafu. For example, da60-250, da50, da35, da55, and Big Star 200. These are all fully usable models.