Originally posted by TwoUptons In good light, the K1/K1ii will focus with a 400mm f5.6 and the 1.7x autofocusing converter, which is, what, f10?
-Eric
of course they will, with some compromises that are sometimes needed, my K1 with FA 80-320 / 4.5-5.6 with AFx1.7 at 320 / 5.6 displays as 550 / f8 , the f8 aperture displays in the full range regardless of the fact that on the lens f4.5 to 200 mm, and on 320 mm is f5 .6, indoors at 1055 lumens / 13W LED indirectly light with pre-focusing at 550 (320) mm / f8 K1 at ISO 51200 at a distance from the focus point approx. 3 m focused on static focus without any problems
one of my old posts on Pentax Forum (14-06-20) related to AFx1.7 on K1 and Lens Discussion:
(from hand without tripod):
Pentax K1+Pentax FA80-320/4,5-5,6 (silver) +adapter Pentax F AFx1,7
camera settings are:ISO: 6400, Shutter Speed: 1/320 sec., Aperture: f11
in 35 mm: 550 mm (without circumcision)