Originally posted by Rondec I would choose FA 77 on full frame, DA *55 on crop. If you had the funds, the DFA 70-200 is ideal.
I have the new 70-200 from Pentax. For me this lens is a little bit to heavy for portrait! I came from an K-3 with the 2.8/50-135 which has a total weight of 1.5kg With the 70-200 i have about 2 1/2 kg when connected to the K-1
Also I have dozen of zooms in the area from 80-135 but they are slow. My 2.8/50-135 is only for APS-C, the other are all F>3.5
But the restriction is to make only pictures with primes :-(
I have no interest spending about US$ 1000 for an SMC Pentax-FA 77mm F1.8 Limited with an nearly 20 years old design. I am sure when I would buy this 77mm Ricoh will announce a redesign in a couple of weeks. On their Roadmap is already an 1.4/85mm. I want to wait till this is available!