Forgot Password
Pentax Camera Forums Home
 

Reply
Show Printable Version Search this Thread
01-04-2016, 10:26 AM   #1
Senior Member




Join Date: Feb 2013
Posts: 157
In body lens correction

Hi,

I have a little question.

Does someone know how the lens corrections (distortion, chromatic aberration and peripheral illumination correction (vignetting)) are stored in the raw file?
Is the "raw" file modified? Is it "written" somewhere?

Thanks :-)

01-04-2016, 10:46 AM   #2
Senior Member




Join Date: Dec 2013
Location: Buffalo, NY
Posts: 293
They are stored in exif tags in the raw file. (See link here, half way down the page under "Pentax LensCorr Tags")
You can look at tags by uploading a photo here and searching for 'correction'

If you use the Pentax supplied SilkyPix it might use the correction information you have set, but I know that when I open the raw DNG in DXO it doesn't use the in camera corrections and I apply the DXO correction files it loads for camera / lens combinations. (Probably similar for Lightroom)

In camera lens corrections only works with specific later Pentax lenses (most DA / DA* lenses I believe). Lens corrections will not work with old manual lenses or third party lenses (Tamron, Sigma, etc) One advantage of DXO is that they have a good set of correction files for many common lenses that Pentax cameras doesn't have lens correction for. (Tamron, Sigma, Samyang).

Another advantage if you use raw and turn off in camera lens correction is that you avoid the 1 second delay after taking a picture when it process the corrections. (Most important to me since I like to zoom in on the image preview somewhat often, and if you turn the back e-dial before the lens corrections are finished you end up changing your aperture setting without realizing it.)
01-04-2016, 11:12 AM   #3
Senior Member




Join Date: Feb 2013
Posts: 157
Original Poster
QuoteOriginally posted by TheOneAndOnlyJH Quote
They are stored in exif tags in the raw file. (See link here, half way down the page under "Pentax LensCorr Tags")
You can look at tags by uploading a photo here and searching for 'correction'

If you use the Pentax supplied SilkyPix it might use the correction information you have set, but I know that when I open the raw DNG in DXO it doesn't use the in camera corrections and I apply the DXO correction files it loads for camera / lens combinations. (Probably similar for Lightroom)
Thanks for your reply :-)
I'm using Lightroom exclusively, so I could turn it off without losing anything? If only LR had more profiles!!

QuoteOriginally posted by TheOneAndOnlyJH Quote
In camera lens corrections only works with specific later Pentax lenses (most DA / DA* lenses I believe). Lens corrections will not work with old manual lenses or third party lenses (Tamron, Sigma, etc) One advantage of DXO is that they have a good set of correction files for many common lenses that Pentax cameras doesn't have lens correction for. (Tamron, Sigma, Samyang).
I've noticed that. Only my 35 f2.4 works. Not even my FA50 :/

QuoteOriginally posted by TheOneAndOnlyJH Quote
Another advantage if you use raw and turn off in camera lens correction is that you avoid the 1 second delay after taking a picture when it process the corrections. (Most important to me since I like to zoom in on the image preview somewhat often, and if you turn the back e-dial before the lens corrections are finished you end up changing your aperture setting without realizing it.)
OMG! I've had that sooooo many times! It's really annoying!
01-04-2016, 11:38 AM   #4
Senior Member




Join Date: Dec 2013
Location: Buffalo, NY
Posts: 293
If you work entirely in raw it sounds like you don't need them enabled. (Unless you shoot RAW + JPEG and want to use it for the JPEG's.) I hate that pause, but I sometimes use the JPG's before I can process the raw files, so I leave in camera corrections on anyway.

Try a quick comparison. Set the camera to RAW + JPEG and Manual mode and take a shot on a tripod using your 35m f/2.4 with and without in camera correction enabled. Comparing the JPG files the distortion difference should be obvious. Run the raw files for the same photos through Lightroom and compare to see if the distortion is different. If they both look the same then Lightroom isn't using the correction info and you can disable in camera corrections without noticing any change except for ditching that annoying pause.

01-04-2016, 11:48 AM   #5
Administrator
Site Webmaster
Adam's Avatar

Join Date: Sep 2006
Location: Arizona
Photos: Gallery | Albums
Posts: 43,147
QuoteOriginally posted by Azergoth Quote
I'm using Lightroom exclusively, so I could turn it off without losing anything? If only LR had more profiles!!
Right. Lens corrections don't really do anything in RAW mode apart from telling the Pentax desktop software that they should be applied.

Lightroom uses its own suite of lens profiles, which you can choose to apply on a per-photo basis when developing.

Adam
PentaxForums.com Webmaster (Site Usage Guide | Site Help | My Photography)



PentaxForums.com's high server and development costs are user-supported. You can help cover those costs by donating. Or, buy your photo gear from our affiliates, Adorama, B&H Photo, or Topaz Labs, and get FREE Marketplace access - click here to see how! Trusted Pentax retailers:

01-04-2016, 12:34 PM   #6
Senior Member




Join Date: Feb 2013
Posts: 157
Original Poster
QuoteOriginally posted by Adam Quote
Right. Lens corrections don't really do anything in RAW mode apart from telling the Pentax desktop software that they should be applied.

Lightroom uses its own suite of lens profiles, which you can choose to apply on a per-photo basis when developing.
QuoteOriginally posted by TheOneAndOnlyJH Quote
If you work entirely in raw it sounds like you don't need them enabled. (Unless you shoot RAW + JPEG and want to use it for the JPEG's.) I hate that pause, but I sometimes use the JPG's before I can process the raw files, so I leave in camera corrections on anyway.
Yes, I always shoot RAW, never Jpeg...

QuoteOriginally posted by TheOneAndOnlyJH Quote
Try a quick comparison. Set the camera to RAW + JPEG and Manual mode and take a shot on a tripod using your 35m f/2.4 with and without in camera correction enabled. Comparing the JPG files the distortion difference should be obvious. Run the raw files for the same photos through Lightroom and compare to see if the distortion is different. If they both look the same then Lightroom isn't using the correction info and you can disable in camera corrections without noticing any change except for ditching that annoying pause.
Ow! Great idea! I tried two different photos, but the RAW + JPEG mode is the way to go! 👍🏻
Reply

Bookmarks
  • Submit Thread to Facebook Facebook
  • Submit Thread to Twitter Twitter
  • Submit Thread to Digg Digg
Tags - Make this thread easier to find by adding keywords to it!
body lens, correction, dslr, k-3, k3, lens, pentax k-3
Thread Tools Search this Thread
Search this Thread:

Advanced Search


Similar Threads
Thread Thread Starter Forum Replies Last Post
in camera lens correction options phoenixvision Pentax K-3 6 12-11-2014 12:57 PM
Pentax q lens correction in RAW files Dijker_t Pentax Q 10 06-25-2014 07:00 AM
Automatic horizon correction in K7 Pentax body scc Troubleshooting and Beginner Help 4 06-16-2013 11:21 AM
Lens correction for your A-lenses in Lightroom derAngler Pentax Medium Format 3 07-13-2012 12:31 PM
In Camera Lens correction? Arbalist Pentax K-5 3 03-14-2011 02:21 AM



All times are GMT -7. The time now is 10:07 PM. | See also: NikonForums.com, CanonForums.com part of our network of photo forums!
  • Red (Default)
  • Green
  • Gray
  • Dark
  • Dark Yellow
  • Dark Blue
  • Old Red
  • Old Green
  • Old Gray
  • Dial-Up Style
Hello! It's great to see you back on the forum! Have you considered joining the community?
register
Creating a FREE ACCOUNT takes under a minute, removes ads, and lets you post! [Dismiss]
Top