[ephophex]

HD DA 21 for APS-C:



DA* 300 for FF:

Those are both *stunners*! Beautiful work.

[Gary H Perth]

One favourite from each brand and generation:

Pentax K 55mm/f1.8
Pentax M 200mm/f4 beats the 40mm/f2.8, 50mm/f1.4 and 135mm/f3.5. The tough call was with the 28mm/f3.5, as both the 28mm and the 200mm are stunningly sharp with great colour rendition.
Pentax A 100mm/f2.8 possibly just shades the 50mm/f1.7
Pentax HD DA 21mm/f3.2 Limited, tied with 70mm/f2.4 Limited - they make a superb pair, one a bit wide and one a bit tele.
Pentax FA 50mm/f1.4 - does not get as much use as it deserves, because I tend to grab the tiny DA 40mm instead.
Tamron Adaptall 90mm/f2.5 52BB, with PKA adapter, and I also have both the 01F teleconverter and the 1:1 extension tube to match
Sigma EX DG 105mm/f2.8, 1:1 macro, although much bigger and seems heavier than the Tamron.
Tokina 17mm/f3.5
Vivitar (Komine) 135mm/f2.8 PKA mount gets more use than the similar-aged 24mm, and is amazingly sharp.

From all of this list, only one is ALWAYS in the bag because it is light, fast, amazingly sharp and very versatile - the Pentax DA 21mm Limited! I always have one or two of the tele primes with me, but the choice depends on the intentions of my day out (usually the 70mm Limited and the M 200mm/f4).

[doc_taz_nj]

I'm with the OP. I love the 35mm f2.4 and 50mm f1.8 DA lenses. They also work well in full frame (for me, that's currently a MIJ *ist 35mm film camera).

Right now, I'm loving my SMC DA 21mm Limited. Great wide view, and nice bokeh wide open so it can be used for portraits and close up shots. It's also terrific for low light shooting. Great lens for street shots and landscapes. Need to play with it more indoors.