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07-22-2018, 03:48 AM   #1
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HD Pentax-DA 20-40mm F2.8-4 for K-1 (or an alternative)?

I did an event today, and for the first time I found myself running out of space to back up in for a wide group shot. I am looking for a lens that if possible can be used fully (or near fully) on both FF and Crop. Typically I think I would have a prime on my K-1 (85/1.4) and for when I run out of room something wider is required, like perhaps the HD Pentax-DA 20-40mm F2.8-4 on the KP. It may be for some events I swap the two around.

Anyway, I'm after advice on what the HD Pentax-DA 20-40mm F2.8-4 is like, in general, on crop vs ff etc. Or if there are better alternatives...

07-22-2018, 03:52 AM   #2
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There is the FA20-35 f4 available used... And several third-party solutions from the film era (I have the Tokina and like it a lot).

But I seem to recall folks who’ve tried the 20-40 not being totally happy with the results...

-Eric
07-22-2018, 04:04 AM   #3
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QuoteOriginally posted by TwoUptons Quote
There is the FA20-35 f4 available used... And several third-party solutions from the film era (I have the Tokina and like it a lot).

But I seem to recall folks who’ve tried the 20-40 not being totally happy with the results...

-Eric
Good to know!
07-22-2018, 04:25 AM   #4
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At the last wedding I did, my most used combinations were the 50-135 on the K-3 and the 20-40 on the K-1. The 20-40 is very useable on the K-1 from about 24-36, and wide open to about f/11. You can push it to 22mm, but expect to do some PP work on vignetting.

I really liked the results with the 20-40 on the K-1. If I have a little time this afternoon, I’ll sit down at my computer and post a couple here.

07-22-2018, 04:26 AM   #5
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The 20-40 is an awesome APSC lens, but I think the 24-70 would be more useful on both the KP and K-1 given that it's FF and greater FL range. I find that the range of 24-70 very useful for for me on my K-3.
07-22-2018, 05:00 AM   #6
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QuoteOriginally posted by twilhelm Quote
At the last wedding I did, my most used combinations were the 50-135 on the K-3 and the 20-40 on the K-1. The 20-40 is very useable on the K-1 from about 24-36, and wide open to about f/11. You can push it to 22mm, but expect to do some PP work on vignetting.

I really liked the results with the 20-40 on the K-1. If I have a little time this afternoon, I’ll sit down at my computer and post a couple here.
Thanks, I would appreciate that.

QuoteOriginally posted by dcpropilot Quote
The 20-40 is an awesome APSC lens, but I think the 24-70 would be more useful on both the KP and K-1 given that it's FF and greater FL range. I find that the range of 24-70 very useful for for me on my K-3.
Of course the 24-70 is the better choice, it's also 3x the price!

In an ideal world you'd wield a 24-70 and a 70-200, but I don't have $4700 floating around lol.

I just can't see me pulling my 85/1.4 off that much from the K-1. The widest lens I have is a ff 24mm (SMC-Pentax-A 24/2.8), and I find that MF with a wide lens is way harder, I'm kinda thinking that anything getting wide needs AF at an event, so I'm researching my options.
The widest AF lens for APS-C I have is a DA 40 XS, which ironically I get a wider FoV with it sitting on the K-1, but I really want the 85/1.4 on that camera, it leaves the KP with only 40mm, which is the narrow end of the wide spectrum I'm looking for...

Can you whack a Sigma Art 35/1.4 on an APS-C (KP) and get wider? I need to go find that reference chart thing again...

I see the Sigma 17-50/2.8 gets nice attention, but it is only APS-C, I would like to have something interchangeable if possible...
07-22-2018, 05:53 AM   #7
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QuoteOriginally posted by BruceBanner Quote
Thanks, I would appreciate that.



Of course the 24-70 is the better choice, it's also 3x the price!

In an ideal world you'd wield a 24-70 and a 70-200, but I don't have $4700 floating around lol.

I just can't see me pulling my 85/1.4 off that much from the K-1. The widest lens I have is a ff 24mm (SMC-Pentax-A 24/2.8), and I find that MF with a wide lens is way harder, I'm kinda thinking that anything getting wide needs AF at an event, so I'm researching my options.
The widest AF lens for APS-C I have is a DA 40 XS, which ironically I get a wider FoV with it sitting on the K-1, but I really want the 85/1.4 on that camera, it leaves the KP with only 40mm, which is the narrow end of the wide spectrum I'm looking for...

Can you whack a Sigma Art 35/1.4 on an APS-C (KP) and get wider? I need to go find that reference chart thing again...

I see the Sigma 17-50/2.8 gets nice attention, but it is only APS-C, I would like to have something interchangeable if possible...
The big plus of the DA20-40 Ltd besides its very good IQ is it's weight of only 291g. The thing that until now prevented me from buying it, is that it's not fully FF compatible. But I'm always thinking back and forth because it would optimize my current "hiking kit" in weight: KP • DA15 • (DA20-40 would substitute DA18-135) • DA55-300PLM • DA TC1.4x - very lightweight for the quality it offers.
07-22-2018, 06:49 AM   #8
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Not sure price was mentioned as a concern. In any case, you may be able to find a used 24-70 for about $800 USD


QuoteOriginally posted by BruceBanner Quote

Of course the 24-70 is the better choice, it's also 3x the price!.


07-22-2018, 07:41 AM - 1 Like   #9
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I have used the DA20-40 ltd with my k-1 for over a year now for event photography... and I am quite happy with that combination despite the crop-sensor lens design. Keeping in mind that there are some limitation (vignetting) at certain focal lengths (mostly between 20-24), but still I find the benefits (light weight, versatility, price and image quality etc.) are worth it until there is DFA version of 20-40 is available.
07-22-2018, 01:22 PM   #10
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What about the Sigma 17-50/2.8, is that any good? It seems to be quite a bit cheaper than the 20-40, offers more range as well and better apertures throughout, however I'm not sure what the results are with it stuck on the K-1...
07-22-2018, 01:33 PM - 1 Like   #11
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and it's not a Limited...
07-22-2018, 01:48 PM   #12
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QuoteOriginally posted by dcpropilot Quote
Not sure price was mentioned as a concern. In any case, you may be able to find a used 24-70 for about $800 USD
Sorry, didn't mean to be snippet lol, I'm just lens envy of those that have them! The DA 20-40 can be had for new at $750AUD currently, the Sigma 17-50 for $400AUD! A second hand 24-70 is still gonna be very expensive at $800USD, $700AUD is about the max I can afford at this time.

QuoteOriginally posted by aleonx3 Quote
I have used the DA20-40 ltd with my k-1 for over a year now for event photography... and I am quite happy with that combination despite the crop-sensor lens design. Keeping in mind that there are some limitation (vignetting) at certain focal lengths (mostly between 20-24), but still I find the benefits (light weight, versatility, price and image quality etc.) are worth it until there is DFA version of 20-40 is available.
I would love to see some examples if you'd care to share (or PM me if you like).

I'm imagining it would sit indefinitely on the KP, but I would like to ability to throw it on the K-1 and get some use from it there as well.
07-22-2018, 01:55 PM - 1 Like   #13
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Here's a couple of examples of the K-1 and 20-40.

The first is at 40mm f/4 to give you an idea of the vignetting.



This one is at 36mm f/4.5



I do have some shot wider and wide open, but I'm headed to work right now.
07-22-2018, 02:14 PM   #14
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QuoteOriginally posted by twilhelm Quote
Here's a couple of examples of the K-1 and 20-40.

The first is at 40mm f/4 to give you an idea of the vignetting.



This one is at 36mm f/4.5



I do have some shot wider and wide open, but I'm headed to work right now.
No thanks that was great. No rush, talk later, have a great day! (look fwd to more examples).
07-22-2018, 06:17 PM   #15
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QuoteOriginally posted by acoufap Quote
But I'm always thinking back and forth because it would optimize my current "hiking kit" in weight: KP • DA15 • (DA20-40 would substitute DA18-135) • DA55-300PLM • DA TC1.4x - very lightweight for the quality it offers.
Of these, I've got the DA 20-40, DA 18-135 and DA 55-300 PLM. The 18-135 is no less sharp than the 20-40 in their common range, but the major gain from the 20-40 over the 18-135, apart from a little faster aperture and lighter weight, is its beautiful rendering. What you are contemplating would be a very good kit, if you don't mind the lens changes.
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