Originally posted by pathdoc I don't think Pentax will touch this one, though - too specialised, and too narrow a market for a relatively niche player.
Consider this:
If Pentax will make an D-FA 135 f/1,8 or 2,0..
Then an APD or STF version will be a very cheap and easy addition for them. This version will add very little cost, and may sell for a significantly higher price. It will also have much value to their marketing, having a dream portrait lens none of their competitors have. (Sony don’t have that large aperture, Fuji don’t have that portrait focal length, C and N don’t have the APD or STF)
The FA135 have been out of production for 16 years now, and its possibly the ugliest lens Pentax have made. Not that it matters for the images, but I suspect it may have affected the sales and would do that again if it was put into production again. Pentax needs a prettier D-FA 135 lens. Not necessarily a f/2,8 even if that would be a nice lightweight and semi-affordable addition to the f/1,8 or 2,0 version. I think the f/1,8 or 2,0 version is the most important one, partly because its not covered (spec-wise) by any zoom and because STF/APD would be a cheap and logical addition.
If one is so interested in 135mm that one buys a 135mm prime in stead of just including its usage in a 70-200 f/2,8, the chances are high that this person have more then average interest for taking portraits, and wants something more then 135mm f/2,8. Be it bokeh (f/1,8-2,0 APD/STF) or size (Limited WR). I'm just not shure if a f/1,8-2,0 non STF/APD version would make much sense (depends on how well they get the APD/STD version to autofocus).