Summary: This is a lens whose reputation is best known in all of the pentax lens, outstanding optical technology, inside the focus is as sharp as the blade, and outside the focus is melt as cream, almost all of the customers of pentax want to have this lens, this is a full frame lens but it is a pity that the pentax camera didn't have a full frame camera.
Summary: I've been shooting Pentax over 5 years and struggled with the purchase of this fine lens. (Mainly because of the high cost of admission!). Really tough, parting with just under a grand for a 47mm f1.8 lens. Bought the FA 43 a few months ago. Phenomenal lens. Gorgeous colors with silky smooth transitions, just a joy. BUT, not quite wide enough...I'm a portrait shooter. I won't be selling it, but still needed something wider.. Had an FA 50.
Excerpt: i now have all 3 FA Limited lens. began with the 43mm, then the 77mm. i hesitated a long time for this 31mm. was not sure to like the size and the range. i bought it for my 50th birthday to complete my collection. i'm very happy with it. as good image quality as the 2 others, style, design and built quality even better. i use it with my K5II. it's a kit i will always keep.
Excerpt: These are film-era lenses with screw-drive autofocus. Pretty quick but make a slight noise. The older SMC coating is also prone to fringing wide-open in high contrast situations. Luckily there's a PP adjustment in your Pentax body to help minimize. Quirks aside, they quite possibly capture the most stunning and vibrant photos on film or your DSLR sensor, which help explain their continued production and high demand. The FA-31 is the biggest and baddest of the trio.
Pros: Consistent Output, Durable, Easily Interchangeable, Fast / accurate auto-focus, Lightweight, Nice Bokeh, Strong Construction
Excerpt: I bought this lens as an alternative to the DA* 16-50mm f/2.8 for use in travel photography. It is smaller and lighter, without sacrificing quality. So far, I love it, although I haven't yet used it extensively and I am adjusting to the trade-off of the flexibility of the DA* 16-50mm. Haven't decided yet if I will go back to the DA* 16-50mm as my go-to travel & walk-around lens.
Summary: Superbe objectif, très lumineux, avec une focale intéressante. Attention cependant, objectif exclusif : focale fixe, autofocus pas très rapide et assez bruyant : à éviter pour les photographes qui cherchent la polyvalence.
Summary: This lens gets perfect 10 for Design Build quality (smooth metal body) Sharpness Creamy bokeh What more can you ask for? If you are a Pentaxian, you owe it to yourself. Just buy it and you will find yourself smiling every time you pick up your camera.