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12-12-2014, 03:15 PM   #1
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A new lens I'd like to see

Has anyone else noticed the new Canon EF-S 24mm f2.8 pancake lens (APS-C)? All of $150 at B&H. I'd love one of these in a Pentax mount. How about it, Pentax? It would be fine even with the slotted screw focusing set-up.

12-12-2014, 03:30 PM   #2
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Would be a nice idea for a budget lens, but if you can afford it the DA 21 already fills the gap.

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12-12-2014, 03:36 PM   #3
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QuoteOriginally posted by mechmike10 Quote
Has anyone else noticed the new Canon EF-S 24mm f2.8 pancake lens (APS-C)? All of $150 at B&H. I'd love one of these in a Pentax mount. How about it, Pentax? It would be fine even with the slotted screw focusing set-up.
The DA 21 Ltd is a great lens.
12-12-2014, 03:40 PM   #4
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The SMC Pentax (K) 1:2.8 24mm is an excellent lens on the Pentax dslr *, and PF member dcshooter did a great job restoring the one I have.
Edit: * And also on the 35mm Pentax MX

Edit2 My version is a K, not an -M


Last edited by wombat2go; 12-13-2014 at 07:59 AM.
12-12-2014, 04:01 PM   #5
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QuoteOriginally posted by mechmike10 Quote
Has anyone else noticed the new Canon EF-S 24mm f2.8 pancake lens (APS-C)? All of $150 at B&H. I'd love one of these in a Pentax mount. How about it, Pentax? It would be fine even with the slotted screw focusing set-up.
I did right away. I would was quite jealous of this option, although I would love 24-28mm F2 for $200 instead.
12-12-2014, 04:13 PM   #6
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I suspect the hole will be filled by a fast FF weather sealed lens down the track. It won't be $200.
12-12-2014, 04:28 PM   #7
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QuoteOriginally posted by robjmitchell Quote
I suspect the hole will be filled by a fast FF weather sealed lens down the track. It won't be $200.
I don't suspect that either. It's difficult to find a cheap and fast 35mm equiv. for any system.
12-12-2014, 09:30 PM   #8
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QuoteOriginally posted by wombat2go Quote
The SMC Pentax -M 1:2.8 24mm is an excellent lens on the Pentax dslr *
I have the K 24mm f/2.8 which has a ridiculously short focus throw for such a wide angle lens. Other than the DA21 the sigma 18-35mm f/1.8 ART is really the only other option. But that lens is massive and isn't even remotely capable of covering FX format at focal lengths below 32mm. The sigma 15-30mm f/3.5-4.5 is an interesting FX format lens but it is far from compact.


Pentax K 24mm f/2.8, SMCP-FA31mm f/1.8 Limited, Sigma 15-30mm f/3.5-4.5, Sigma 18-35mm f/1.8.

12-12-2014, 09:41 PM   #9
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Or just ask for an XS version of the 21 Ltd. It'd be about 75% the price (given the relationship of the 40mm XS to the 40mm Ltd) and quite a bit thinner.
12-13-2014, 12:12 AM   #10
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QuoteOriginally posted by Digitalis Quote
I have the K 24mm f/2.8 which has a ridiculously short focus throw for such a wide angle lens. Other than the DA21 the sigma 18-35mm f/1.8 ART is really the only other option. But that lens is massive and isn't even remotely capable of covering FX format at focal lengths below 32mm. The sigma 15-30mm f/3.5-4.5 is an interesting FX format lens but it is far from compact.


Pentax K 24mm f/2.8, SMCP-FA31mm f/1.8 Limited, Sigma 15-30mm f/3.5-4.5, Sigma 18-35mm f/1.8.
The older Sigmas 20, 24, 28, F1.8 are there too. Also large lenses, but at least they are fast and focus close.
12-13-2014, 08:06 AM   #11
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QuoteOriginally posted by Digitalis Quote
I have the K 24mm f/2.8 which has a ridiculously short focus throw for such a wide angle lens.
Thanks Digitalis, My version is also a K and I amended my post.
Yes the focus throw is only 1/4 turn, the reasons for that may be known to the designers from the past.
Maybe due to the DOF, by the scales ( for 35mm format) the 24mm lens has f/8 DOF from about 1 metre to infinity.

With the split in the MX viewfinder it is still possible to bring the image into sharp focus.
( Now that I have the interocular implant in my focussing eye!)
12-13-2014, 06:12 PM   #12
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I'm sure the Pentax 21 is a wonderful lens, but at $567 vs. $150, I don't see it. To justify the price difference it would have to be 3.78 times better, which I doubt. I don't realistically expect to see Pentax build such a lens because it would certainly cannibalize sales of the more expensive lens.
12-13-2014, 06:55 PM   #13
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QuoteOriginally posted by wombat2go Quote
Yes the focus throw is only 1/4 turn, the reasons for that may be known to the designers from the past. Maybe due to the DOF, by the scales ( for 35mm format) the 24mm lens has f/8 DOF from about 1 metre to infinity.

I haven't used the K 24 f/2.8 all that much since I got my Sigma 18-35mm f/1.8 ART, But I can say your theory about the K24 is sound, Pentax wanted this lens to be used for the snapshot photographers - hence the hyperfocal marking which makes it easy to take photos: just set the lens to f/8 and you're done. Though the K24 has an uncommon 52mm filter thread (which the K50mm f/1.2 has) is a bit mystifying.
12-13-2014, 09:33 PM   #14
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QuoteOriginally posted by Digitalis Quote
Though the K24 has an uncommon 52mm filter thread (which the K50mm f/1.2 has) is a bit mystifying.
The other quality prime option at around 24mm, the ZK 25/2.8, has a 58mm thread.

I believe that Pentax would have liked to have designed the K24/2.8 for a 49mm thread,
since they always listed it in with the M lenses that standardized on 49mm,
but I suspect that it just wasn't possible given the size of the front element.

---------- Post added 12-13-14 at 10:37 PM ----------

QuoteOriginally posted by mechmike10 Quote
I don't realistically expect to see Pentax build such a lens because it would certainly cannibalize sales of the more expensive lens.
Well, Pentax has done cheapo versions at 35mm and 50mm,
but I don't think those lenses are cannibalizing the DA 35 Ltd or DA*55.
12-13-2014, 09:40 PM   #15
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QuoteOriginally posted by lytrytyr Quote
I believe that Pentax would have liked to have designed the K24/2.8 for a 49mm thread, since they always listed it in with the M lenses that standardized on 49mm,

I think that was a marketing decision - as the K24 has the Pentax brand nameplate around the front element - if they didn't have that, it would have been possible to give the K24 a 49mm filter thread.

QuoteOriginally posted by lytrytyr Quote
The other quality prime option at around 24mm, the ZK 25/2.8, has a 58mm thread.
Sadly those Zeiss lenses have been discontinued - finding one second hand will be difficult.
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