Originally posted by Douglas_of_Sweden You are mixing things up. The 31ltd is a pure pentax patent by Takayuki Ito and Murata Masayuki. Jun Hirakawa originally desined a slower 31mm f2.4, but Pentax wanted a faster lens and gave the task to Ito and Masayuki.
The 77/1.8 ltd was not a new design. It uses the same optical design as the A*85/1.4 by Ogawa Ryota. They just cut down the speed and gave it autofocus. The A*85 is anyway soft at f1.4.
Don't diss the DA limiteds. My two favorits among them are the 21ltd and 70ltd, both designed by Masakazu Saori...the same guy who designed the DFA* 70-210mm f2.8, currently the chief lens designer at Pentax.
through the viewfinder: Known Pentax lens designs and designers Having read different, I'm interested in your source.
Based on the renditions of images seen on the forum, I find the 77 and 31 both amazing lenses, though as a mainly wildlife/ landscape photographer who uses zooms in the wide end, I'd have little use for either. I own the 21 and have seen many DA 70 images. The DA 70, IMHO the only reason to take it over the 77 is price, and while the 21 is a great lens on APS-c, my take would be the 31 on FF is much better, and faster.
But then, my philosophy has always been cover your range w it 3.5-4.6 zooms and fill in with primes where you need speed. The 77, 31 and 43 are al 1.8 sub ƒ2 lenses. The DA limited, not so much. That being said, I put the 21 ltd on the camera whenever I can. It's the only limited I own, and I just reach for it whenever possible.