Originally posted by lawsonstone I remain convinced this whole thing is a hoax. I hope it's not. For Hoya-Pentax do pull off some kind of "hail mary" surprise play that made them suddenly the dominant innovator in the industry would be awesome…but it's just such fantasies that perpetrators of such hoaxes seek to exploit.
Releasing a 50mm 1.0 would be interesting, and would get Pentax some positive recognition. But in no way does releasing 1 ultra-fast lens suddenly make you a dominant innovator in the industry, they'll have to do a lot more than that. And Canon has already had a AF 50mm F1.0 out for about 20 years or so & many years before that a 50mm 0.95 for their rangefinders, so this isn't really that innovative. I'm entirely for a FF DSLR and certainly have nothing against them releasing lenses like this though.
Zebooka,
Quote: DFA645 25/2.8 - no, too short for Medium Format. 35 - may be, but not 25 (and 3.5-4.0 instead of 2.8)
DFA645 55/2.8 - surely yes
DFA*50/1.0 SDM - NO! Rear lens won't fit K mount
DA135/2.8 LIMITED - DA? No! Also it will be huge due to physics, so it won't be pancake.
DFA*20/2.8 SDM - No! DFA has aperture ring, which is "bad idea with no aperture coupler in camera".
DA*400/4 ED (IF) SDM - yes, it can exist. Or in 5.6 version. Or in 4.5.
To the 645 lenses, cropped sensor, so certainly plausible.
50mm/1.0 - I'm not enough of an expert on the K mount or optical design to say if it's possible or not. I know that the Canon EOS mount is a bit larger, but not dramatically, and they have a 50mm/1.0. I do recall Canon claiming the change to the EOS mount's design from FD partly to allow lenses such as the 50mm/1.0, so I'm sure it would be pushing the limits of the K mount.
135mm/2.8 - I've seen 135/2.8 lenses that I wouldn't call 'huge', and Pentax has shown the ability to produce very compact lenses for their specs. And regardless, Pentax could make any lens they want and slap 'limited' on it.
20mm/2.8 - If Pentax comes out with a FF DSLR, I think that there's a reasonable chance that they'd put the aperture coupler back in. And even if they did not, the lens would obviously have an 'A' setting anyway. So nothing wrong with an aperture ring IMO, really I would give Pentax a lot of credit as it would mean that they're acknowledging film users and giving it backwards compatibility. Being SDM, it would need the screw drive also for backwards compatibility.
I don't know if any of this is real or not, I don't get too caught up into these stupid little teases that randomly show up. I will say that I am strongly for a FF DSLR, it will help Pentax and it has many advantages. I've always said that IMO about the only valid argument against FF is cost, but sensor design continues to improve and cost continue to drop.