Pentax and Olympus seem now to have stripped themselves of the deadwood of some older lens designs for 35mm film cameras that are of far less interest with thier DSLR formats. Pentax has apparently discontinued many of its 35mm format lenses, leaving the list at
http://www.pentaxslr.com/lensesplus four new DA lenses announced as coming soon. The list of Pentax lenses currently in production (as opposed to ones still available but no longer in production) might be as short as the following:
DA 10-17 Fish Eye
DA 12-24/4
DA 14/2.8
DA 16-45/4
DA 18-55/3.5-5.6
FA 31/1.8 Limited
DA 40/2.8 Limited
FA 43/1.9 Limited
FA 50/1.4
DFA 50/2.8 Macro
DA 50-200/4-5.6
FA 77/1.8 Limited
DFA 100/2.8 Macro
with the following expected soon:
DA 16-50/2.8 (Autumn 2006)
DA 21/3.2 Limited (June 2006)
DA 50-135/2.8 (Autumn 2006)
DA 70/2.4 Limited (Autumn 2006)
If so, about the same size as the Olympus 4/3 lens list, but with more primes at "middle focal lengths" while Olympus has more telephoto extremes and a wider range of zooms.
P. S. I just found another longer and probably definitive list of Pentax lenses currently in production at
http://www.digital.pentax.co.jp/en/lens/It adds the following:
FA-J 18-35 f/4-5.6
FA 20-35 f/4
FA-J 28-80 f/3.5-5.6
FA 28-105 f/3.2-4.5
FA-J 75-300 f/4.5-5.8
FA 35 f/2
FA 135 f/2.8
FA 300 f/2.8
FA 600 f/4
My guess is that these nine extra lenses are being marketed only towards to 35mm film camera users, and so the other site "
www.pentaxslr.com" omits them, being entirely oriented to Pentax's digital SLR's.