Originally posted by Emacs That is properly made 31Ltd, as well as 77.
I don't particularly like 43 though.
I owned the 31mm first, because I got a good deal on it.
The focal length is very useful for somewhat wide shots and what I would consider "casual" environments such as sitting across the table from someone.
Kinda big, but very handy all-purpose focal length.
Second was the 77mm. This lens is simply amazing. I think it might be the best lens Pentax has made, and I say this from someone who has tried almost all of them (except the FA 85mm 1.4).
I feel this lens can be a little "special purpose" because of the focal length.
Focal length has to be appropriate in your situation, and the environment can't be flare inducing (I wouldn't use this lens on a bright sunny day, I'd choose DA*50-135 for that).
Lastly was the 43mm. I wanted to get the DA 55mm 1.4 and agonized over it for a long time. After looking at tons of REAL photographs from this forum and reviews (not technical data). It's my opinion that this has better bokeh.
There are so many opinions on this lens, lol. I wasn't expecting this lens to be as good as the 31mm, or 77mm from what I'd read, But alas I was wrong.
I can easily say that if you're going to own just ONE FA limited (which is highly unlikely after you do own one), this should be it.
Because of the focal length, you're going to be getting closer to people than the 31mm, which makes the bokeh appear creamier than the 31.
I'll say it again, this lens gives better bokeh (at 1.9) than the 31mm, and I know that you can have odd shaped bokeh at 2.8, but it doesn't matter.
It is a MUCH more usable length than the 77mm. The 77mm is for staged portraits, indoor candids where there is room, and outdoor events that do not have harsh light.
Near the end of my Pentax journey, this is the one I reached for in my bag almost all of the time.
Engagement session: 77mm and 31mm primarily
Walk around, one lens, various shooting, a party: 43mm
Dark close environment (restaurant or bar): 31mm
I do think if you wanted an outdoor portrait lens the DA 55mm 1.4 might be the best choice right now, but I never got a chance to use one.
FA Limiteds ARE flare prone, there is a lot to be said for DA lenses in this regard. This is the price you pay for having the better bokeh though.
I prefer the bokeh of the FA limiteds vs the flare resistance of the DA limiteds. If you lived in the tropics or somewhere with lots of harsh bright light, the DA's might be a better option.
I hope my personal experiences can help
Thanks,
Alfred