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Yamakasi · 05-31-2016, 07:53 AM - **5 Likes**

Based on my very unofficial testing, the DA20-40 limited is usable from 24-40mm (after some pp) on k1

at 24mm

at 26mm

---------- Post added 05-31-16 at 10:58 PM ----------

at 30mm

at 40mm

btnapa · 05-31-2016, 08:19 AM

Originally posted by Yamakasi

Based on my very unofficial testing, the DA20-40 limited is usable from 24-40mm (after some pp) on k1

at 24mm

at 26mm

---------- Post added 05-31-16 at 10:58 PM ----------

at 30mm

at 40mm

Good to know. By the way is the PP to correct for vignetting or something else?

Yamakasi · 05-31-2016, 08:29 AM

Originally posted by btnapa

Good to know. By the way is the PP to correct for vignetting or something else?

yes, pp is to correct vignetting

**MJSfoto1956** · 05-31-2016, 09:27 AM

Can you get a decent square crop @ 20mm?

M

Yamakasi · 05-31-2016, 10:43 AM - **3 Likes**

Originally posted by MJSfoto1956

Can you get a decent square crop @ 20mm?

M

not the best of sample

at 20mm uncrop

1:1 crop

16:9 crop

skierd · 05-31-2016, 11:55 AM

Very encouraging though, maybe there is life for me 20-40 if I upgrade from my k30 to the k1

Cynog Ap Brychan · 05-31-2016, 12:13 PM

This is very interesting. I liked the look of this lens, but never considered getting it because the equivalent FoV on APS-C of 30-60mm didn't fit well with my type of photography. In fact, I have a Sigma 20-40mm f2.8 from my film days that I never used after I went digital. Now the lens looks much more attractive to me, given a usable range starting with 24 mm (a bit wider with some cropping), and the fact that it's less bulky than the Sigma, and it's weather resistant.

**jrpower10** · 05-31-2016, 09:19 PM

So I thought some other examples might help folk see how the 20-40 performs on the K-1. These are just some shots I grabbed this evening, to PP other than the cropped samples. First set is at 40mm, starting at f4 and each stopped down 1 stop to f11. The more the lens is stopped down at 40mm, the worse the vignetting (BTW, removed the hood for these to minimize vignette).

The second set is at 20mm, again starting at f2.8 thru f11. Least vignetting seems to be f5.6 or f8 at 20mm. In all cases, 1:1 crops appear OK, and some 4x5 or even 4x3 can be achieved with a bit of work.

For me, I don't think it's a keeper so I'll be putting this one for sale, but within limitations looks like you can get usable results.

05-31-2016, 07:53 AM - 5 Likes	#1
Yamakasi Forum Member Join Date: Mar 2011 Posts: 73	Using the DA20-40 limited on K1 Based on my very unofficial testing, the DA20-40 limited is usable from 24-40mm (after some pp) on k1 at 24mm at 26mm ---------- Post added 05-31-16 at 10:58 PM ---------- at 30mm at 40mm

05-31-2016, 09:19 PM	#8
jrpower10 Site Supporter Join Date: Sep 2011 Location: Richland, Washington, USA Posts: 935	So I thought some other examples might help folk see how the 20-40 performs on the K-1. These are just some shots I grabbed this evening, to PP other than the cropped samples. First set is at 40mm, starting at f4 and each stopped down 1 stop to f11. The more the lens is stopped down at 40mm, the worse the vignetting (BTW, removed the hood for these to minimize vignette). The second set is at 20mm, again starting at f2.8 thru f11. Least vignetting seems to be f5.6 or f8 at 20mm. In all cases, 1:1 crops appear OK, and some 4x5 or even 4x3 can be achieved with a bit of work. For me, I don't think it's a keeper so I'll be putting this one for sale, but within limitations looks like you can get usable results. Attached Images

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05-31-2016, 08:19 AM	#2
btnapa Pentaxian Join Date: Oct 2013 Posts: 1,621	Originally posted by Yamakasi Based on my very unofficial testing, the DA20-40 limited is usable from 24-40mm (after some pp) on k1 at 24mm at 26mm ---------- Post added 05-31-16 at 10:58 PM ---------- at 30mm at 40mm Good to know. By the way is the PP to correct for vignetting or something else?

05-31-2016, 08:29 AM	#3
Yamakasi Forum Member Join Date: Mar 2011 Posts: 73 Original Poster	Originally posted by btnapa Good to know. By the way is the PP to correct for vignetting or something else? yes, pp is to correct vignetting

05-31-2016, 09:27 AM	#4
MJSfoto1956 Site Supporter Join Date: Dec 2013 Location: Boston Posts: 1,305	Can you get a decent square crop @ 20mm? M

05-31-2016, 10:43 AM - 3 Likes	#5
Yamakasi Forum Member Join Date: Mar 2011 Posts: 73 Original Poster	Originally posted by MJSfoto1956 Can you get a decent square crop @ 20mm? M not the best of sample at 20mm uncrop 1:1 crop 16:9 crop

05-31-2016, 11:55 AM	#6
skierd Veteran Member Join Date: Mar 2011 Location: Fairbanks, AK Photos: Gallery Posts: 1,472	Very encouraging though, maybe there is life for me 20-40 if I upgrade from my k30 to the k1

05-31-2016, 12:13 PM	#7
Cynog Ap Brychan Veteran Member Join Date: Sep 2012 Location: Gloucester Photos: Gallery Posts: 1,199	This is very interesting. I liked the look of this lens, but never considered getting it because the equivalent FoV on APS-C of 30-60mm didn't fit well with my type of photography. In fact, I have a Sigma 20-40mm f2.8 from my film days that I never used after I went digital. Now the lens looks much more attractive to me, given a usable range starting with 24 mm (a bit wider with some cropping), and the fact that it's less bulky than the Sigma, and it's weather resistant.

Using the DA20-40 limited on K1

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