Excerpt: Bought this to use primarily as a portrait lens for the K-5ii and the K-1 once it comes out in a few weeks. So no feedback yet on how it works not he latter, but on the former, it's a dream. Solid construction, beautiful bokeh, and tack sharp where it needs to be.
Excerpt: I now use a 15 mm, 31 mm, and 50 mm focal length primes for almost all of my photography. Unless I am in an auditorium and can't move, this trio of lenses gives me the range I need for landscapes and portraits.
The FA 31mm has very high resolution and very good bocah.
Excerpt: I use this fantastic lens with Sony A7RII with Pentax K to Sony FE adapter.
I did compare with Sony FE "native" lenses such as Sony/Zeiss FE 35mm f2.8.
Pentax 31mm f1.8 is much better. Ideal focus lange for travels and landscapes.Fantastic contrast, color rendering and excellence resolution.
Summary: There are plenty of reviews on this excellent lens already including professional reviews. If you're looking at this lens for a portrait lens then you can't go wrong. This lens is basically a cult lengendary lens. It is pretty much what everyone has raved about.
Excerpt: The FA 77 is a fine short telephoto I have found useful for landscapes, wildlife and portraits. There is a magical quality to the light captured by this lens and the contrast and colors are the most vivid of my Three Amigos (FA31, FA43 and FA77).