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03-15-2019, 06:03 PM   #1
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DA12-24 on Full Frame

I gather this lens is actually compatible with the K-1 from around 16-24mm. That's kinda attractive being a KP/K-1 kinda guy. I could see me using it on both systems from time to time. What does seem to be hard to find however is the performance of the lens on the K-1 at 18-24mm, specifically comparing with a crop lens at equivalent ranges.

Example, tripod up the KP or K3, use the 12-24 at 12-16mm (equivalent to using at 18-24), take some shots (f4, f8 etc). Then take the KP/K3 off, put on the K-1 and use at 18mm-24mm, test at same apertures. The should both offer similar if not identical field of views, one 24mp the other 36mp. How do they compare? Sometimes when these lenses are ff they do poor, other times the additional resolution is welcome!

Anyone have this lens with a crop body and ff sensor to compare? Anyone just simply got ff shots with the 12-24 to share? It seems actually quite hard in the K-1 line up to get a lens from 18-24mm that is reasonably priced and has AF, which is part of my attraction to seeking out this lens in the future.



03-15-2019, 08:12 PM - 1 Like   #2
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Another option might be the original digital lens the FAJ 18-35 , coming from the film era to digital , it has coverage for full frame.
03-15-2019, 08:57 PM - 1 Like   #3
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QuoteOriginally posted by garywakeling Quote
Another option might be the original digital lens the FAJ 18-35 , coming from the film era to digital , it has coverage for full frame.
Yeah I thought of that, they are kinda hard to come by. I'd appreciate the consistent F4 across the frame, and by all accounts the 12-24 is sharp wide open at F4. Comparing with the FAJ 18-35 would be interesting to see. Of course the 12-24 has Quickshift as well, a nice touch.
03-15-2019, 11:01 PM   #4

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I have had a Pentax 12-24 for about 7-8 years.... that I've used to take countless pictures, mostly hot rods, vintage cars, sports cars and old motorcycles....also some family/friends pictures. All pics with this lens were while it was attached to either my K10D, Km or K5. This is a wonderful lens, sharp...almost 3D it seems sometimes. One of my favourite lenses of all time..or at least my time, which is about 50 years of photography.

I've got a K-1, have had for a over two years and I haven't tested it on my K-1. I've been happy with the 28-105, but sometimes I wished the wide angle end was just a little wider. I believe it (12-24) may function reasonably well from 18-24, but not sure as I haven't tried it.

I'm not sure of the conversion ASP-C\FF; is the 18 ASP-C more like 27 mm on FF ? I do use ASP-C lenses like my 40 and 70 Limiteds...but with the K1 body set on FF, not ASP-C and I would set the K1 on FF with my 12-24.

This year for sure. I'll be interested in how it does. I'm not completely sure, but I think PF member Clackers may have some experience/knowledge about how the K1/12-24 works out.

03-16-2019, 01:03 AM   #5
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Just like lesmore49 guessed, it works ok from 18-24mm.

I am shooting it always with ff setting and cropping afterwards. The hood frames the photo nicely between 12-17mm so I'm leaving it on. Taking it away won't give any benefit because of the softness on the far corners, usable up from 18mm.
It's not stellar with K-1. But very nice on holiday trip photos.
03-16-2019, 02:26 AM   #6
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personally I don't have a K 1 or K 1 II, so I cannot offer personal experiences

but there is this article that might be of interest to the OP and others


Full Frame Coverage of DA Lenses: Comprehensive Test
Which DA lenses cover the full 24x36 mm frame?
By PF Staff in Gear Guides on Jan 7, 2019

Read more at: Full Frame Coverage of DA Lenses: Comprehensive Test - Gear Guides |


" Based on our findings with these tables we rated the lenses from zero to three stars according to these criteria:

[ three stars ] Full coverage at all tested F-stops and all focal lengths

[ two stars ] Full coverage at some F-stop and focal length combinations

[ one star ] The lens can be used with reservations at select F-stop/focal length combinations. The main flaw is typically heavy vignetting and corner softness may also be present

[ minus sign ] No coverage at all

The DA 12-24mm zoom lens thus gets two stars according to our evaluation criteria. "

Read more at:

Last edited by aslyfox; 03-16-2019 at 02:32 AM.
03-16-2019, 06:26 AM   #7
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I agree that from 18 up it is usable. I lived with it that way for awhile, then bought a 15-30. Since then, I've hardly used the 12-24, though it might make sense if one wanted to pack light.
03-16-2019, 07:37 AM   #8
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I have a 12-24 and is a very nice lens on a crop sensor. I have the K-3 ( and other crop bodies) and K-1ii and have used the 12-24 on both crop and ‘full frame’. While you get full frame coverage on the K-1ii from 18-24 it is really only useful from 20-24 if you want to preserve decent edge sharpness. I rarely use that combination since I own the DFA 15-30 2.8 which is of course excellent.


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