Originally posted by maverickh Hi Douglas,
Thanks for the contributions. Apart from the fact that its at f/1.8. what are qualities makes it special.
Seldom get to see photos taken from this lens . any idea how many were manufactured. I understand that Canon also has a 135mm f/2. Any idea what is holding back Pentax from manufacturing this lens in DA format.
What is most unusual to me is how sharp and contrasty it is a wide open. Of course all lenses lose a bit of these qualities wide open simply because wider apperture means more stray light beams, more or less a natural law, but this lens suffers less from that than other fast tele lenses I've tried. The A*135/1.8 is clearly more usable at f1.8 than the A*85/1.4 is at f1.4 (unless you want the 85 to go a bit soft for portrait).
You sometimes here that the A line were less well built than the M and K line. I think that is comming from a few plastic details in the most mass produced kit zoom lenses and the plastic internal detail that sometimes break in the apperture ring of the A50/1.7 and A50/2, but the rest of the line were pure metal and glass, and the A* lenses are as well built as any K lenses. The A*135 is a joy to focus, gives you a bright viewfinder and has a smooth focus throw.
As for why there is no DA*135/1.8. There never was a F* or FA*135/1.8 either. That is more of a mystery to me. For the DA line, I simply think that Pentax did not expect to sell enough of it having lost market shares throughout the 90's and being late into the digital age. With market share picking up with more and more K-x, K-r and K-5 bodies sold, I hope they will again launch some high spec lenses. But before giving anything similar to the A*135 I'd like to see the A*200/4 macro or FA*200/4 macro in a DFA* version.
As for quantity, I don't know. But based on that it appears to be about as unusual as the FA*200 macro, which I've heared was only built in 1100 copies, I'd guess something similar. That's not much on a global basis. Especially considering that some ended up on the shelfes of collectors.