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08-07-2012, 07:49 AM   #16
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QuoteOriginally posted by snake Quote
I kind of don't understand why we can't even get faster pancakes from Pentax in this wider range. From what I understand, the FA24 is large, in part, due to being IF. Correct me if I'm wrong. I really love how Canon went with that 22 f2 pancake for the new mirrorless cam. Hopefully they come up with something or thereabouts for the K01, since there's no mirror to screw things up.
My understanding is that it is difficult to design a quality lens that is optically shorter (focal length) than the distance between the rearmost element and the sensor (physical length). I'm going to use Leica lenses as an example, because they used to maintain both short register distance (rangefinder) and long register distance (SLR) systems. The 21mm f/3.4 Super-Angulon-R from 1964 and 21mm f/3.4 Super-Angulon from 1963 are good examples, because they are basically the same lens--a Schnieder design--except the SLR version cannot be used without locking the mirror up. Pentax could design something like this for the K-01. For a less extreme (and more recent) comparison, look at 28mm. The 28mm Elmarit-R II from 1994 and 28mm Elmarit-M IV from 1992 are contemporary designs, though optically different, but the more modern SLR design is considerably larger and nearly twice the weight. The current 28mm f/2.8 M lens is even smaller and lighter, due to its use of aspheric optics.

My understanding is that the FA*24/2 is historically prominent due to the pioneering (in a consumer application) use of a rather complicated aspheric element. Manufacturing technology for aspheric lenses has grown by leaps and bounds over the last 20 years, meaning that a redesigned 24/2 could be both smaller and higher quality at the same price point, not to mention the possibility of making it smaller...but the 21/3.2 shows us where Pentax decided to prioritize the size/speed/cost compromise.

08-07-2012, 10:47 AM   #17
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QuoteOriginally posted by calsan Quote
Hi Twitch
Well the FA*24 is a strong contender for 'Lens that should have been re-released for digital'. However, it's kind of large by comparison with the limiteds, as your picture shows.
I just hope if they ever issue a 24/28mm lens, they don't do a plastic fantastic with no quick shift. I'm prepared to pay for a limited with these specifications.
Wrong. A retrofocus design for a 35 mm camera would be overdesigned for APS-C. They could come up with something much smaller, so a new 2/24 mm lens would be nice. Same holds for the FA31, but you can still get the original.
I suppose Pentax is not releasing any more APS-C only lenses because they either go out of business or want to present a full frame camera soon.
08-07-2012, 10:49 AM   #18
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QuoteOriginally posted by vrrattko Quote
Well, I wouldn't mind 58mm thread like 31 Limited in return for faster than 2.8 max aperture. Hell, I wouldn't even mind something huge like Sigma 24/1.8, what matters to me is the performance really. What is the point in ultra compact pancake lenses? I mean they are brilliant designs, but i suspect they could be even better performers if the designers weren't constrained by the size limits. Personally I think a bit bigger lenses like fa31, k20/4 or k85 give me better hold and stability.
Anyway I would like to see 24mm f2 from Pentax, limited, star or plastic, but it must be optically good. Meanwhile I'm starting to think about that Sigma 24 or Zeiss 25...
How can you use Sigma 1.8/24 and performance in the same sentence??? The 2.8 Sigmas were nice, the Zeiss distorts too much. Wait for photokina.
08-07-2012, 11:48 AM   #19
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So the Sigma 24 1.8 isn't that much to speak of? I can see right away that it's HUGE.

08-07-2012, 02:05 PM   #20
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QuoteOriginally posted by zapp Quote
the Zeiss distorts too much.
In what way?
08-07-2012, 02:22 PM   #21
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QuoteOriginally posted by calsan Quote
Hi Twitch
Well the FA*24 is a strong contender for 'Lens that should have been re-released for digital'. However, it's kind of large by comparison with the limiteds, as your picture shows.
I just hope if they ever issue a 24/28mm lens, they don't do a plastic fantastic with no quick shift. I'm prepared to pay for a limited with these specifications.
My brilliant idea from last year was filling the 21-31mm gap with two lenses. One is plastic like the 35/2.4 and 50/1.8, something like a 26mm f2.8. The idea is a second or third prime lens for newer photographers, though it would appeal to others. The lens would have to be pretty good anyway because the kit lens is actually decent in this range. It's 26mm because it's Pentax. The second is a high-end lens like the DA* 55/1.4, say 24mm f2, with WR. That's the lens for everyone who won't buy the cheap 26mm. Adding WR gives people another reason to buy Pentax over Sigma.
08-07-2012, 03:04 PM   #22
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I'd love 300 2.8 or a 180 2.0 Ltd.
08-07-2012, 07:25 PM   #23
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QuoteOriginally posted by tabl10s Quote
I'd love a 180 2.0 Ltd.
For a Limited, with 49mm filter thread, it would have to be f/4.

Basically an Apo-Lanthar:

Voigtlander 180mm f/4 APO-Lanthar SL Lens Reviews - Voigtlander Lenses - Pentax Lens Review Database

08-07-2012, 11:13 PM   #24
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QuoteOriginally posted by Just1MoreDave Quote
My brilliant idea from last year was filling the 21-31mm gap with two lenses. One is plastic like the 35/2.4 and 50/1.8, something like a 26mm f2.8. The idea is a second or third prime lens for newer photographers, though it would appeal to others. The lens would have to be pretty good anyway because the kit lens is actually decent in this range. It's 26mm because it's Pentax. The second is a high-end lens like the DA* 55/1.4, say 24mm f2, with WR. That's the lens for everyone who won't buy the cheap 26mm. Adding WR gives people another reason to buy Pentax over Sigma.
However, Pentax charges a premium of hundreds over competitors for the WR, with some deciding it's not worth it. For example the Sigma 50 1.4 over the DA*55 1.4.
08-07-2012, 11:38 PM   #25
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I'd rather see a DA*24mm f/1.4 than a 24mm f/2 Limited
08-07-2012, 11:40 PM   #26
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QuoteOriginally posted by Just1MoreDave Quote
Adding WR gives people another reason to buy Pentax over Sigma.
Not for long, Sigma are now adding WR on their new design lenses
08-08-2012, 12:07 AM   #27
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QuoteOriginally posted by SyncGuy Quote
I honestly don't see them producing "professional" prime lenses, IMO.. The only way that i see them doing a workaround to that is to stall for time for another 10-20 years when it'll be considered a standard for APS-C sensors to be able to produce minimal noise at ISO 12000++..
what lenses in the Pentax lineup would you not consider "professional"?
08-08-2012, 03:33 AM   #28
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QuoteOriginally posted by Pablom Quote
what lenses in the Pentax lineup would you not consider "professional"?
Don't know the proper term to use, that's why i use a "" on it... Hmm... I don't know how to elaborate, but it's supposed to be a subjective term that can be defined by each individuals themselves.
08-08-2012, 04:24 AM   #29
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QuoteOriginally posted by TOUGEFC Quote
I'd rather see a DA*24mm f/1.4 than a 24mm f/2 Limited
and it will cost me a kidney or may be both.

I have and use the canon fd 24/1.4 on nex, no AF, but the optic quality is superb.
I also have the nikkor 24/2 ai since FA24/2 is too pricy.
Sure the DA*24/1.4 would be awesome
08-08-2012, 11:52 AM   #30
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QuoteOriginally posted by zapp Quote
I suppose Pentax is not releasing any more APS-C only lenses because they either go out of business or want to present a full frame camera soon.
Huh?? There are several of them on the roadmap (most probably quite expensive) and we will likely see the first of them in September at Photokina....
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