Asahi Pentax-F 70-200mm - vintage lens eview
The F series were the first autofocus lenses produced by Pentax around 1988 to 1991. They used a screw-drive type autofocus, meaning that the motor was in the camera body, which surprisingly is still supported by modern Pentax digital cameras. At the same time, being able to focus manually and having a physical aperture ring means that they can also be used with older analog bodies, like the k1000 or this p30. I just love how Pentax engineers have managed to keep everything compatible for, what, 40 plus years now? The lens has a plastic body, it weights 500g, it is 116 to 160mm long and it has an external diameter of 72mm, with a 49mm front thread. The iris had 9 blades, the aperture is clicked and it goes from f4 at 70mm or f5.6 at 200mm to f32 with half steps plus auto. The small green dot indicates the actual aperture at 200mm. The focusing ring is small and not really meant to be used manually and it turns 240 degrees. Minimum focusing distance is 1,1 meters and the front turns whe