Distortion Correction feature in K-x and K-7


wywysimba

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Mar 17, 2009
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SG
#1
Dear K-x/ K-7 users.
Has anyone tested the ‘distortion correction’ feature?
Any comments on whether it really works? Or is it better to do post image processing (e.g. using Photoshop, PTLens, etc)?
 

poseur

Senior Member
Jul 27, 2009
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#2
Dear K-x/ K-7 users.
Has anyone tested the ‘distortion correction’ feature?
Any comments on whether it really works? Or is it better to do post image processing (e.g. using Photoshop, PTLens, etc)?
if i am not wrong, i had ask the simliar question before

Think it only work for pentax DA series of lense only.

3rd party lenses or older series of lenses may not have the data commuciation between the body and the lenses
 

night86mare

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Aug 25, 2006
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#3
Dear K-x/ K-7 users.
Has anyone tested the ‘distortion correction’ feature?
Any comments on whether it really works? Or is it better to do post image processing (e.g. using Photoshop, PTLens, etc)?
from tests i've seen, when you can use it, it works at correcting lens characteristic problem.
 

wywysimba

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Mar 17, 2009
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#4
Yes, I read somewhere that the feature only works when you shoot with a DA or DFA lens.
Just wondering whether any of the K-x/K-7 users have actually tested this feature and can share on how well this feature works for you.

To be honest, I was rather surprise to see this feature available in K-x/K-7 as it is usually only available in more expensive camera. If it really works, it will save me a massive amount of time (i.e. instead of having to shoot in RAW mode and do post processing).

I've been using Nikon D40 for years, and experienced quite a fair bit of barrel distortion when using the kit lens (well, I suppose this problem is common for most of the zoom lenses out there?). Time to upgrade the gear and thought the "distortion correction" feature is one I will need when getting my new DSLR.
 

night86mare

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#5
Yes, I read somewhere that the feature only works when you shoot with a DA or DFA lens.
Just wondering whether any of the K-x/K-7 users have actually tested this feature and can share on how well this feature works for you.

To be honest, I was rather surprise to see this feature available in K-x/K-7 as it is usually only available in more expensive camera. If it really works, it will save me a massive amount of time (i.e. instead of having to shoot in RAW mode and do post processing).

I've been using Nikon D40 for years, and experienced quite a fair bit of barrel distortion when using the kit lens (well, I suppose this problem is common for most of the zoom lenses out there?). Time to upgrade the gear and thought the "distortion correction" feature is one I will need when getting my new DSLR.
distortion correction off on k-x



distortion correction on



images taken from: http://www.dcresource.com/reviews/pentax/kx-review/using
 

creampuff

Senior Member
Jul 11, 2006
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Dover
#6
With firmware update 1.03 on the K-7,

Lens Correction (Distortion, Lateral chromatic aberration) is settable for the following FA Limited lenses:
smc PENTAX-FA 31mmF1.8AL Limited
smc PENTAX-FA 43mmF1.9 Limited
smc PENTAX-FA 77mmF1.8 Limited
 

creampuff

Senior Member
Jul 11, 2006
5,116
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Dover
#8
Yes, I read somewhere that the feature only works when you shoot with a DA or DFA lens.
Just wondering whether any of the K-x/K-7 users have actually tested this feature and can share on how well this feature works for you.

To be honest, I was rather surprise to see this feature available in K-x/K-7 as it is usually only available in more expensive camera. If it really works, it will save me a massive amount of time (i.e. instead of having to shoot in RAW mode and do post processing).

I've been using Nikon D40 for years, and experienced quite a fair bit of barrel distortion when using the kit lens (well, I suppose this problem is common for most of the zoom lenses out there?). Time to upgrade the gear and thought the "distortion correction" feature is one I will need when getting my new DSLR.
Yes this feature works but there is a small penalty in terms of image processing time, which does affect the time to preview the image and in outright fps the camera is able to shoot. If you want an in-camera no-fuss approach to distortion correction, this is a good solution.

However if you do happen to have the new Adobe Photoshop CS5, one can have on-the-fly lens distortion correction based on presets of popular lenses from different camera makes. You can shoot in both jpeg or RAW and even create your own lens correction setting presets. Very quick timesaver during post processing, so it all depends where you want the corrections done.
 

#9
Looks quite good to me but i heard that if they are on picture take longer to be saved and you can't instantly preview your images:dunno: (even though i don't do that now...)

Ot but i hope the K-7 will have the cross processing filter :lovegrin:
 

night86mare

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#10
However if you do happen to have the new Adobe Photoshop CS5, one can have on-the-fly lens distortion correction based on presets of popular lenses from different camera makes. You can shoot in both jpeg or RAW and even create your own lens correction setting presets. Very quick timesaver during post processing, so it all depends where you want the corrections done.
they have correction for the sigma 10-20? :lovegrin:

if that's so, i must get cs5 asap when i change computer. :lovegrin:

or maybe i should just get ptlens.. it's only usd25 after all... :D
 

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airconvent

Senior Member
Apr 12, 2005
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#11
The camera must be able to recognize the lens for this feature to work properly. And yes, because it needs to do image processing in-camera, so it will take longer to save the photo. I mean even your desktop PC will take a second or 2 to process and edited image, right?
But generally, the images are not so distorted that will require you to need adjustment full time. Just keep it off and use it if you notice distortion in the image. :)
 

wywysimba

New Member
Mar 17, 2009
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#12
distortion correction off at 18mm (kit lens): 0.8%

distortion correction on at 18mm (kit lens): 0.1%

distortion correction off at 55mm (kit lens): 0.2%

distortion correction on at 55mm (kit lens): non-existant

for k-x, images from: http://www.imaging-resource.com/PRODS/KX/KXA4.HTM
Thanks for sharing the review website!
Wow, seems like this feature works pretty well for the kit lens (at the widest end). By the way, here's the correct pix for 'distortion correction on at 18mm':
http://www.imaging-resource.com/PRODS/KX/ZKXhVFAW_DC_550.jpg


If you want an in-camera no-fuss approach to distortion correction, this is a good solution.

Yep, that's me - the lazy type... prefer to have everything done in-camera.
 

wywysimba

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Mar 17, 2009
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#13
Hi airconvent,
since you are a K7 user, can I check with you whether it is possible to customise a hardware button to quickly enable/disable the distortion correction feature? or must you go into the menu to enable/disable it?
 

airconvent

Senior Member
Apr 12, 2005
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#14
Hi airconvent,
since you are a K7 user, can I check with you whether it is possible to customise a hardware button to quickly enable/disable the distortion correction feature? or must you go into the menu to enable/disable it?
Sorry Bro. I don't use button customization but did a quick check of the manual and can't find anything about changing button functions. Perhaps someone else can confirm this?
;p
 

creampuff

Senior Member
Jul 11, 2006
5,116
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Dover
#16
With the K-7, if the rear LCD is off, press the Info button twice (if status display is already on, press the info button once only... pretty obvious lah) and use the 4 way controller to navigate to the distortion correction/lateral chromatic aberration correction tab. Use the rear e-dial to enable or disable. Takes no more than a few seconds. What's so difficult about it?

The camera manual is provided for you to read up on the camera's features, and if you take the time to figure out the controls yourself, you'll find that you'll get most out of your camera. Don't expect to be spoonfed info all the time.
:nono:
 

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wywysimba

New Member
Mar 17, 2009
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#17
Thanks all for the comments.
Will be getting the K-7. well, after getting approval from the Finance Minister at home...
 

creampuff

Senior Member
Jul 11, 2006
5,116
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Dover
#18
they have correction for the sigma 10-20? :lovegrin:

if that's so, i must get cs5 asap when i change computer. :lovegrin:

or maybe i should just get ptlens.. it's only usd25 after all... :D

Some latest info for you:

Adobe has posted a pre-release version of its Lens Profile Creator utility that enables creation of custom lens profiles for Photoshop CS5, ACR 6.1 and Lightroom 3. The process involves downloading and printing a checkerboard test chart from Adobe Labs, and shooting a series of RAW or non-RAW images. These can then be imported to the Lens Profile Creator to generate custom profiles for the Lens Correction feature in Photoshop CS5 and Lightroom 3. Furthermore, these profiles can also be shared via the company's user community.

http://labs.adobe.com/technologies/lensprofile_creator/?PID=3154956
 

night86mare

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#19
Some latest info for you:

Adobe has posted a pre-release version of its Lens Profile Creator utility that enables creation of custom lens profiles for Photoshop CS5, ACR 6.1 and Lightroom 3. The process involves downloading and printing a checkerboard test chart from Adobe Labs, and shooting a series of RAW or non-RAW images. These can then be imported to the Lens Profile Creator to generate custom profiles for the Lens Correction feature in Photoshop CS5 and Lightroom 3. Furthermore, these profiles can also be shared via the company's user community.

http://labs.adobe.com/technologies/lensprofile_creator/?PID=3154956
mmmm that sounds good.

ok, when i get back firmly to singapore and finally purchase a pc i'll probably finally move on from cs2. :bsmilie:
 

wrx_sti_22b

Senior Member
Apr 14, 2005
4,968
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Compassvale Lane
#20
The distortion correction works for all Sigma & Tamron lens as well? I can't tell if the distortion is corrected a not... ;p
 

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