Crop mode quality on K1

LongTimePentaxian · 10-26-2016, 05:09 AM

Hello all Pentaxians, greetings from Norway :-)
Have anyone tried the DA 12-24 in crop mode on the K1?
If yes, are the results better than DA 12-24 on a K5?
At the moment I'm using a K3, but thinking of a K1 as well

Not a Number · 10-26-2016, 05:57 AM

See the following threads:

https://www.pentaxforums.com/forums/190-pentax-k-1/331192-iq-comparison-betwe...e-ff-mode.html
https://www.pentaxforums.com/forums/190-pentax-k-1/326093-k1-crop-mode-why-you-should-love.html

LongTimePentaxian · 10-26-2016, 09:22 AM

THanks for the links, much appreciated

Simen1 · 10-26-2016, 02:12 PM

Hei, fellow Norwegian.

I checked the DXO mark measurements and it looks like it may suffer a bit from low sharpness outside the APS-C crop area, as it already suffers from that at APS-C corners between 15-20mm. It also looks like it suffers quite a bit from CA, actually over a large part of the APS-C field and it looks like CA is an increasing problem towards the corners. Its fair to extrapolate that CA will be a problem outside APS-C crop too. CA may be reduced in post processing to some extent.

I have never been a fan of that lens and did some other choices myself. I do have a plan to use the Sigma 18-35mm f/1,8 on K-1. Its an APS-C lens but the image circle are larger then APS-C on all focal lengths. At 30-35mm its large enough to cover the entire FF sensor. I will use this in FF mode and crop manually to a suitable crop factor and aspect ratio.

I have had a Sigma 10-20 and a Tamron 10-24 but I found out that I prefer primes in the very wide end. So when I upgrade to K-1 I consider ether to keep my current Samyang 8mm f/3,5 (and use it in crop mode) or sell it and buy a Samyang 12mm f/2,8 in stead. I don't mind the lack of zooming action or autofocus for ultra wide angles. I don't think I need anything in between 12mm and the Sigma 18-35mm @ 30mm.

klaus123 · 10-29-2016, 11:26 AM

Hello

I have the DA12-24 for 10 years now - and since I got my K1 I use it in FF-Mode too.
Including the lens hood 18-24mm cover full frame quite well.

Without the lenshood even shorter focal length works for non-2:3 shapes. CAs are mainly a F4.0-problem..F5,6...F11 it disapears and sharpness bekames quite ok too.
I would nor buy this lens for a K1 but if a DA12-24 is available it is a siutable solution for me.

Keep in mind, that the angle of view for 18mm on FF is identical to 12mm on CROP. For real ultra wide shots I got a Tamron 14/2,8.

LongTimePentaxian · 10-30-2016, 06:10 AM

Hello again Simen1 and Klaus123,
thanks for your reply and advice, much appreciated :-)
I have to think twice regarding use of this lens on a K1 then.
All the best :-)

10-26-2016, 05:09 AM	#1
LongTimePentaxian New Member Join Date: Aug 2015 Posts: 13	Crop mode quality on K1 Hello all Pentaxians, greetings from Norway :-) Have anyone tried the DA 12-24 in crop mode on the K1? If yes, are the results better than DA 12-24 on a K5? At the moment I'm using a K3, but thinking of a K1 as well

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10-26-2016, 05:57 AM	#2
Not a Number Moderator Join Date: Mar 2012 Location: Venice, CA Posts: 10,526	See the following threads: https://www.pentaxforums.com/forums/190-pentax-k-1/331192-iq-comparison-betwe...e-ff-mode.html https://www.pentaxforums.com/forums/190-pentax-k-1/326093-k1-crop-mode-why-you-should-love.html

10-26-2016, 09:22 AM	#3
LongTimePentaxian New Member Join Date: Aug 2015 Posts: 13 Original Poster	THanks for the links, much appreciated

10-26-2016, 02:12 PM	#4
Simen1 Veteran Member Join Date: Jul 2009 Location: Tromsø, Norway Photos: Albums Posts: 1,031	Hei, fellow Norwegian. I checked the DXO mark measurements and it looks like it may suffer a bit from low sharpness outside the APS-C crop area, as it already suffers from that at APS-C corners between 15-20mm. It also looks like it suffers quite a bit from CA, actually over a large part of the APS-C field and it looks like CA is an increasing problem towards the corners. Its fair to extrapolate that CA will be a problem outside APS-C crop too. CA may be reduced in post processing to some extent. I have never been a fan of that lens and did some other choices myself. I do have a plan to use the Sigma 18-35mm f/1,8 on K-1. Its an APS-C lens but the image circle are larger then APS-C on all focal lengths. At 30-35mm its large enough to cover the entire FF sensor. I will use this in FF mode and crop manually to a suitable crop factor and aspect ratio. I have had a Sigma 10-20 and a Tamron 10-24 but I found out that I prefer primes in the very wide end. So when I upgrade to K-1 I consider ether to keep my current Samyang 8mm f/3,5 (and use it in crop mode) or sell it and buy a Samyang 12mm f/2,8 in stead. I don't mind the lack of zooming action or autofocus for ultra wide angles. I don't think I need anything in between 12mm and the Sigma 18-35mm @ 30mm.

10-29-2016, 11:26 AM	#5
klaus123 Senior Member Join Date: Apr 2011 Location: Germany Posts: 238	Hello I have the DA12-24 for 10 years now - and since I got my K1 I use it in FF-Mode too. Including the lens hood 18-24mm cover full frame quite well. Without the lenshood even shorter focal length works for non-2:3 shapes. CAs are mainly a F4.0-problem..F5,6...F11 it disapears and sharpness bekames quite ok too. I would nor buy this lens for a K1 but if a DA12-24 is available it is a siutable solution for me. Keep in mind, that the angle of view for 18mm on FF is identical to 12mm on CROP. For real ultra wide shots I got a Tamron 14/2,8.

10-30-2016, 06:10 AM	#6
LongTimePentaxian New Member Join Date: Aug 2015 Posts: 13 Original Poster	Hello again Simen1 and Klaus123, thanks for your reply and advice, much appreciated :-) I have to think twice regarding use of this lens on a K1 then. All the best :-)