Vivitar built a Series 1 28/1.9 in both screwmount and K-mount. Always wanted one. Couldn't afford it new and haven't found a used K version. But it's reportedly a superb lens. Paul On Sep 16, 2006, at 5:55 PM, Adam Maas wrote:
> Godfrey, > > Kiron did make a quite good 28/2 in K mount. You may want to look > around > to see if there is an SMC-A version of it (Mine's in plain K > mount). I'm > not entirely sure, but suspect the Vivitar 28/2 is also the same > design. > > -Adam > > > Godfrey DiGiorgi wrote: >> The 50mm focal length for an SLR is generally implemented as a >> symmetrical lens design because there's enough room for the moving >> mirror behind it, so the size is dependent upon the f/stop and light >> path desired, coupled with the bulkiness of the mount that supports >> the features you want. Compare a Leica Summilux-M 50/1.4 lens with a >> Pentax FA50/1.4 ... the Pentax is darn near the same size, despite >> the mount having a lot more bits in it than the Leica. >> >> Fast 35mm SLR lenses are generally mild inverted telephotos so the >> front elements grow in size compared to RF camera lenses of yore. >> Modern RF 35mm are also often mild inverted tele designs ... my last >> Summicron-M 35/2 ASPH was not much smaller than the Pentax FA35/2 AL, >> if at all. >> >> I don't know that a high quality, very compact 50mm f/2.8 Limited >> would be a bad idea. Although I appreciate the speed of my FA50/1.4, >> it is most often at lens openings of f/4-f/8. Of course, I doubt that >> I need another 50mm lens and would likely not buy it... That DA28/2 >> Limited, on the other hand, would be my most used lens. >> >> Godfrey >> >> On Sep 16, 2006, at 8:30 AM, Shel Belinkoff wrote: >> >> >>> Why couldn't they make a smaller 50/1.4? >>> >>> Yes, a nice, fast 28 would be wonderful, and a 35/1.4 would be a >>> kick as >>> well. >>> >>> Jumping to a 50/2.8 would seem like a real step backwards for any >>> number of >>> reasons. >>> >>> >>>> I don't see that they'd be able to make a 50mm f/1.4-1.2 lens much >>>> smaller than the current FA50/1.4 and it is a great performer. It >>>> would be much more to my liking if they released the same optics >>>> in a >>>> D-FA lens mount. A compact, pancake DA50/2.8 Limited might be neat, >>>> but I'd rather they did a compact DA28/2 Limited! >> >> >> > > > -- > PDML Pentax-Discuss Mail List > [email protected] > http://pdml.net/mailman/listinfo/pdml_pdml.net -- PDML Pentax-Discuss Mail List [email protected] http://pdml.net/mailman/listinfo/pdml_pdml.net
