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Thread started 11 Mar 2016 (Friday) 04:18
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?? Lightroom and non-Canon lenses ??

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Bassat
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Mar 11, 2016 04:18 |  #1
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I just acquired a Tamron 24-70mm VC lens. My other non-Canon lenses are Rokinon 12mm FE and Sigma 15mm FE. Distortion is not an issue with with those. The Tamron has heavy barrel distortion at 24mm, and 2+ EC vignetting at f/2.8 & 70mm. Lightroom has a profile that works really well, IF I SHOOT RAW. I don't always shoot raw, but I see wanting to make those corrections frequently. Is there a way to make corrections to JPG output (the profile is much better than my attempts to correct manually), or should I just always shoot this lens raw?

BTW, LR tools don't work very well on the vignetting at 70mm. It is moderately strong, but it is pushed well into the corners. It is only a problem at f/2.8 - f/3.5.




  
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tzalman
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Mar 11, 2016 09:01 |  #2

Adobe Lens Profile Downloader:
The Adobe Lens Profile Downloader is a free companion application to Photoshop, Lightroom, and the Camera Raw plug-in. It allows customers to search, download, rate, and comment on the online lens correction profiles that are created and shared by the user community.

Adobe Lens Profile Creator:
Adobe® Lens Profile Creator is a free utility that enables the easy creation of lens profiles for use in the Photoshop family of products, such as Photoshop CC, the Camera Raw plug-in, and Lightroom. A lens profile describes the types of optical aberrations that exist in a particular lens and prescribes how to correct the lens distortions in an image captured from the same lens

PDFs and download links at:
https://helpx.adobe.co​m …hop/digital-negative.html (external link)

Elie / אלי

  
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Bassat
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Mar 11, 2016 09:50 as a reply to  @ tzalman's post |  #3
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Thanks. But why bother with DNG when I can just work the .cr2 files.




  
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tzalman
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Mar 11, 2016 12:51 |  #4

Bassat wrote in post #17931628 (external link)
Thanks. But why bother with DNG when I can just work the .cr2 files.

Who said anything about DNG? I thought you were looking for a lens profile for the Tammy 24-70 that can be used with SOOC jpgs. You can check to see if anybody has put one online or you can make your own.

Elie / אלי

  
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vertigo235
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Mar 11, 2016 12:56 |  #5

I didn't realize the profiles only worked with RAW files, interesting.




  
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Bassat
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Mar 11, 2016 14:03 as a reply to  @ tzalman's post |  #6
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The link in post #2 takes me to a description of DNG. Nothing there about JPG profiles.




  
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kirkt
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Mar 11, 2016 14:10 |  #7

Lens profile creator:

https://www.adobe.com …duct=193&platfo​rm=Windows (external link)

http://blogs.adobe.com …profile-creator-tool.html (external link)

The link Elie posted is the link that the Lens Profile Creator page provides - it is not correct, obviously.

Note: in Camera Raw and Lightroom, the lens profile popup will only display the profiles appropriate for the file type. So if you’re looking a raw file, you get to see raw-based lens profiles. If you’re looking at a jpeg, you get to see non-raw-based lens profiles. As you can see, we have many more raw-based lens profiles available than non-raw-based lens profiles. This is due to the fact that lens correction quality for non-raw files (JPEGs, TIFFs, etc.) can be very problematic (this is because it depends on where the JPEG/TIFF came from, and how it was previously processed). For example, a JPEG that comes straight out of the camera is very different from a JPEG that somebody created from a raw file in ACR. If you try to apply the same non-raw-based lens profile to these two cases, you can get quite-different results (even though they’re both JPEGs from the same camera and lens). Thank you for that in-depth information Eric!

from: http://blogs.adobe.com …profile-creator-tool.html (external link)

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Bassat
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Mar 11, 2016 14:21 as a reply to  @ kirkt's post |  #8
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Thank you. I did assume the link was bad. I did not mean to blame the post-er, if that is how it came across.

I did look at the Profile Creator page. Way too involved for a lazy slug like me. I just wanted a downloadable profile. I'll just shoot the Tammy raw. Problem solved. LR has a profile for the lens if I shoot raw. Works like a charm.




  
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kirkt
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Post edited over 7 years ago by kirkt.
     
Mar 11, 2016 14:25 as a reply to  @ Bassat's post |  #9

I made some test charts for my Canon 15mm circular fisheye back when the lens profile creator first came out. It is not worth the hassle unless you have a very specialized need for a correction that does not exist.

kirk

How about that! I found an image I shot when I made the profile - Canon 5D.

IMAGE: https://kirkt.smugmug.com/Photography/Photo-of-the-Day/i-VcF6rFG/0/L/Cor-5DCustom-L.jpg

Kirk
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Bassat
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Mar 11, 2016 14:30 |  #10
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The Profile Creator page states that using it is cumbersome and involved. CR2 solves all of that. I'll just shoot raw. Thanks.




  
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skid00skid00
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Mar 11, 2016 20:23 |  #11

kirkt wrote in post #17931956 (external link)
I made some test charts for my Canon 15mm circular fisheye back when the lens profile creator first came out. It is not worth the hassle unless you have a very specialized need for a correction that does not exist.

kirk

How about that! I found an image I shot when I made the profile - Canon 5D.

QUOTED IMAGE

Kirk, you *must* use 5 printed charts, one in each corner, and the center one, for wide-angle lenses. Using just one, as you show here, won't fix the corners correctly.




  
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kirkt
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Post edited over 7 years ago by kirkt. (2 edits in all)
     
Mar 11, 2016 21:04 as a reply to  @ skid00skid00's post |  #12

Back in caveman times when I did this for my 5D, one chart was good enough! At least that's what the future net ructions said.

Now I use better lenses and let DXO do the work for me.

;-)a

Kirk
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rrblint
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Mar 11, 2016 22:34 |  #13

kirkt wrote in post #17932359 (external link)
...Now I use better lenses and let DXO do the work for me...

THIS (external link) is what I was going to recommend.

Mark

  
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?? Lightroom and non-Canon lenses ??
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