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Thread started 01 May 2010 (Saturday) 19:30
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Lens Profile Creator

 
navydoc
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May 01, 2010 19:30 |  #1

This is a free pre-release program to create custom lens correction profiles for cameras and lenses. These profiles can be used in CS5, ACR and Lightroom.

Anyone going to be creating profiles for their own camera/lens combos? Here's the link:

http://labs.adobe.com …gies/lensprofil​e_creator/ (external link)


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tzalman
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May 02, 2010 04:53 |  #2

These profiles can be used in CS5, ACR and Lightroom.

Small correction:
They are currently usable only in PSCS5, but not in ACR 6.0 (bundled with PSCS5) or any available version of Lightroom. They may be supported in ACR 6.1 and LR 3.0 final release, although no commitment to version or date of release has been made.


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kirkt
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May 02, 2010 18:23 |  #3

There are surprisingly few lens correction profiles shipped with cs5. I suppose adobe will depend on the kindness of the community to augment their lens correction database? If that is the case, it will be interesting to see how this much-touted feature truly works.

The custom profile creation process seems pretty straightforward, I'll give it a go and compare my results to DXO.

Thanks for posting Doc.

Kirk


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datadump
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May 05, 2010 08:10 |  #4

this is amazing. cant wait for LR3


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kirkt
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May 05, 2010 08:34 |  #5

So I have printed a couple of the targets and will try to perform a full calibration today of my 5D + 15mm full-frame fisheye and report back here. From what I have read in the support docs, the profiles shipped with CS5 are essentially "close enough" to be used with other camera bodies - that is, find the lens on the list that you are using and don;t worry so much about the camera body used as the reference body in the database. I'm not sure how accurate this approach is, but I'll try my hand at the process and compare it to the other similar choices in the database and the lens+body specific module in DXO. I have no real metric to use to make a quantitative comparison, so it will be more of a visual comparison for geometry, vignetting and CA.

Kirk


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tzalman
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May 05, 2010 09:25 |  #6

find the lens on the list that you are using and don;t worry so much about the camera body used as the reference body in the database.

That may be true so long as the sensor size (physical dimensions) is the same, but I wouldn't suggest using the profile for a cropper with a FF.


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kirkt
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May 05, 2010 09:53 |  #7

tzalman wrote in post #10125480 (external link)
That may be true so long as the sensor size (physical dimensions) is the same, but I wouldn't suggest using the profile for a cropper with a FF.

This is noted, although the reverse may be okay (ie, using a FF profile for a cropped sensor). I recall reading a FAQ-like passage on this, I'll try to retrace my steps and post it here.

Kirk


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tzalman
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May 05, 2010 11:21 |  #8

I was just looking at the list of profiles here http://forums.adobe.co​m/message/2776627#2776​627 (external link) and aside from the EF-S lenses which obviously have to be on a cropper and two profiles shot on a 1DIII all the others are full frame. I infer from this that you can indeed use the full frame profiles for crop cameras,


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kirkt
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May 05, 2010 12:06 |  #9

Well, after futzing around for a while to get uniform lighting, I shot a quick sequence of nine shots of one of the Adobe targets. I shot using a 5D body, a 15mm full frame fisheye and the 24" tall by 36" wide Adobe target with 54 point squares, 27 x 45 (rows x columns). I printed this target at Kinkos in black and white, where the cost is 75 cents per sq ft. I mounted the target to foam core, then duct taped the board to 3/4" marine plywood that I had lying around to keep the target flat.

I shot in a warehouse, using the overhead fluorescent lamps and trying to position the target where glare would not develop. According to Adobe, you need to shoot 9 images: one straight on, then one tilt up, one tilt down (that's 3). Then move the camera a little to the left, rotate the camera back toward center and repeat (3 more) then move the camera a little right of center ,rotate back toward the center and repeat (3 more). THe idea is to get your target to cover as much of the camera field as possible in these segmented shots.

If you shoot RAW, then shoot these images in RAW and batch convert them to DNG. Then load these DNGs into the Lens Profile Creator app. To make a super duper detailed profile, it is suggested that one shoot this set of images according to the following tree:

For each marked focus distance:
Shoot at the max aperture then at 1/3 stop aperture increments for two stops then at one stop increments to min aperture.

move to the next focus distance and repeat.

This can generate a ton of images, because at each combination of focus distance and aperture, you are shooting nine target images. You must also adjust shutter speed to maintain equivalent exposure.

In an attempt to rough out a lens profile, I shot at one focus distance and one aperture. So, in this simple example I shot at f/2.8 and a focus distance of 0.5m. The camera was placed about 20 inches from the target and I went through the sequence. I get the impression that the Lens Profile Creator is pretty lenient when it comes to the precision of your camera position, squareness and orientation relative to the target.

Anyway - I took the images, converted to DNG, dropped them into the Lens Profile Creator and that was that. It recognized the camera and lens from the EXIF and automatically determined the target that I shot. I hit the "Generate Profile" button and - POW! - done.

Here are some very preliminary examples I found that I had not shot the target square on and that there was also some rotation of my camera relative to the target - no worries. Once the Automatic correction is applied in PSCS5, you can go into the custom tab where all of the previous corrections are available to tweak the final correction.

I am impressed so far, and will now go for the complete sequence of shots to see how it handles multiple focus distances and aperture groups.

Attached is an image of the target, uncorrected and then corrected in PSCS5.

Kirk


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kirkt
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May 05, 2010 12:09 |  #10

Here is a snap with the 15mm fisheye, again original and corrected. These images were auto-corrected by the profile and then tweaked with the custom tab because I was handholding and had some camera rotation, etc. This combination of auto+custom make correction very speedy. I did some simple previewing of the profile compared to the canned profiles for the 5DMkII and they are different, but because the quick and dirty profile I generated is woefully incomplete, I will compare the two after I make the full profile.

Kirk


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scottda
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May 05, 2010 12:14 |  #11

tzalman wrote in post #10126128 (external link)
I was just looking at the list of profiles here http://forums.adobe.co​m/message/2776627#2776​627 (external link) and aside from the EF-S lenses which obviously have to be on a cropper and two profiles shot on a 1DIII all the others are full frame. I infer from this that you can indeed use the full frame profiles for crop cameras,

Correct. This thread on the Adobe forums explains it. http://forums.adobe.co​m/thread/630694?tstart​=0 (external link)
Following is a quote from one of the Lens Profile team members:

Lens profiles created with a reference camera with bigger sensor (like the full frame Canon 1Ds Mark III) works well with other cameras that have a similar sized or smaller sensor, such as 5d Mark i, 5d mark ii, and 1d mark III, or 40D/50D etc. On the other hand, if a lens profile is created from images shot from 40D/50D, the profile might not work well on full frame cameras

Scott


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May 05, 2010 12:44 |  #12

Wow, Kirk, those shots are pretty impressive -- if you can do all that in ACR/LR3, well, hey, the world is ours:)!


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tzalman
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May 05, 2010 16:13 |  #13

Yeah, this is fantastic. I'm waiting for my 5DII to arrive and I'm in suspense waiting to see how my Sigma 15-30 is going to be on it. I have never shot anything so wide - my widest lens on my film cameras was a 24 mm. - but I'm sure it's going to need a lot of correction (even on my 40D I have to be careful with vertical lines near the sides of the frame). Unfortunately, although Sigma profiled all their lenses, that did not include the 15-30 because it is no longer in production. Now, having seen this I am confident I will be able to profile it myself.


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kirkt
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May 05, 2010 17:05 |  #14

Rock on. Hopefully I can get through the complete profile for this lens tonight and make a comparison to the 5dmkII reference, as well as the DXO 5D-Canon 15mm module.

Will post when complete.

Kirk


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kirkt
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May 06, 2010 15:47 |  #15

So here is round two of my attempt to generate a profile. I was not at work today, so I went with natural light - the vignetting model here is probably not so good and I did not enable it. If you want to try it out, here is a link to download it - 45kb file:

http://files.me.com/ki​rkthibault/aj1mdj (external link)

THis profile was shot at a single focus distance, 1m, at the following apertures:

2.8, 4, 5.6, 8, 11, 16, 22 (i.e., one stop increments)

THere were nine images shot per aperture, as the user guide suggests.

Here is the center shot:

IMAGE: http://kirkt.smugmug.com/Photography/Photo-of-the-Day/MG0001-3/858996974_VdTZH-X3.jpg

Here is the auto correction using the profile generated in the process, the 5D + the Canon EF 15mm full-frame fisheye - note that the original was obviously not shot square-on, hence the lack of perfectly rectangular target post-correction:

IMAGE: http://kirkt.smugmug.com/Photography/Photo-of-the-Day/Cor-5DCustom/858996956_o3pxq-X3.jpg

Here is the CS5 5dMkII + EF 15mm lens profile that ships with CS5:

IMAGE: http://kirkt.smugmug.com/Photography/Photo-of-the-Day/Cor-5dMkII/858996939_zhMiS-X3.jpg

Here is the DXO version, with the default DXO adjustments:

IMAGE: http://kirkt.smugmug.com/Photography/Photo-of-the-Day/Cor-DXO/858996924_CSncZ-X3.jpg

THe custom profile is closer to the DXO correction geometrically than the 5DMkII profile that ships with CS5, just from a visual inspection standpoint. Please feel free to copy the images to your computer and layer them and inspect the difference.

I will redo the profile in better lighting when I get a chance.

Kirk

Here is the previous image corrected with this profile and tweaked with the Lens Correction sliders:

IMAGE: http://kirkt.smugmug.com/Photography/Photo-of-the-Day/office/859010753_xdmSn-X3.jpg

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