In Camera Lens Corrections - EOS R5/R6 Tip 46
Вставка
- Опубліковано 31 лип 2024
- Digital processing of lens aberrations has become an increasingly important part of digital photography. The EOS R5, and it's siblings, can correct, in camera, for several lens aberrations including, vignetting, distortion, chromatic aberrations, and diffraction losses. This video looks at the in camera corrections offered in the EOS R5, their capabilities and limitations, and some recommendations for what you should consider using on your camera and why.
══════════════════════
Gear I Use to Make Videos
══════════════════════
(Affiliate links)
- Canon EOS 5D mark IV - amzn.to/3jWCEbx
- Canon EF 40mm f/2.8 STM - amzn.to/3jfVSfk
- Canon EF 24-70mm f/2.8L II USM - amzn.to/2TTEXl1
- Rode NTG2
- Rode Wireless Go
- Zoom F6 - amzn.to/2TWsSvo
══════════════════════
Chapters
══════════════════════
00:00 Intro
00:57 General considerations and limitations
01:05 Supported Lenses
02:39 Raw Files are Unaltered
03:29 Live Image Corrections
03:52 Lens Corrections and Video
04:35 Performance Impacts
04:52 Lenses Requiring Corrections
06:00 Lens Correction Settings
06:27 Peripheral Illumination Correction
07:07 Distortion Correction
07:51 Chromatic Aberration Correction
08:41 Diffraction Correction
10:19 Digital Lens Optimizer
15:25 Recommendations - Наука та технологія
Excellent info. Thank you for breaking all of this down-in particular, explaining the digital lens optimizer setting. 👍
I would like to see a comparison between in-camera corrections and those done in the common post-processing apps.
Excellent presentation. Thank you, Jason.
Amazingly valuable video, the only one on youtube!
Nice. Thanks for the break down
Thanks for the information!!
Thanks for your work.
Great vid. Thanks.
great video
Surprised to find EF lens distortion correction does not work in video, that is strange since it works in still.
Hi: Thanks for the many great videos. I have an R5 and when using the RF14-35mm f/4 lens I sometimes get very dark corners on the RAW images, not the JPEG. Any idea how to correct this? The hood is the proper Canon hood, I only use an UV filter on it.
Raw files aren't altered in camera by the lens correction stuff (or anything else for that matter). The lens corrections have to be done by your raw processing software. That's a popular enough lens, that most software should have a profile for it, so it should be fixable. Either way, I'd start by double checking that those images have lens corrections enabled.
If you don't use Canon's software, you might want to try opening one of the dark cornered images in that to see if it properly corrects them properly.
Barring that, it's possible that you are getting vignetting from the UV filter. I was involved in testing custom designed 4x4 filter holders a number of years ago and one problem we ran into was that they would vignette at close focus distances even if they didn't vignette at near infinity focus.
I don't have the 14-35/4L, but what I've read about the lens is that you do need to use a thin CPL or VND on it. A standard thickness UV filter shouldn't be a problem, but it might still be thick enough to vignette when you're at 14mm and very close focusing distances. Though, if in camera JPEGs shot at the same settings aren't vignetting, then that wouldn't be the problem either.
Great video. Recently i bought the RF 15-35mm f2.8 (on canon r6) that needs some correction for sure. So i should be able to see the dirtortion correction in the viewfinder while shooting, right? Because, i would not like to take a photo that i meticulously framed and then find out that the edges or corners will be cropped out in order to correct the distortion.
Yes, distortion correction is applied to the live image when it's enabled.
@@PointsInFocus Thank you for the answer and the excellent content.
Hello, thank you for the presentation! I shoot with the R5C. When you say that in-camera corrections can be enabled for video, does that mean the corrections will be reflected only in the XF-AVC files? This is what I gather from your comments on the photo side of the camera, where the corrections are only applied to the compressed format (i.e. JPEG). I shoot in RAW LT for video, so I'm assuming that enabling in-camera lens corrections for the RAW LT footage is useless? Thanks again!
That's a great question and I don't have a good answer for it.
So far as I can tell, it seems that raw videos behave the same as raw photos. That is they carry the necessary metadata for the post processing software to correct the image, and instruct the software whether to apply those corrections or not.
Loading raw video in either Canon's Cinema Raw Development Tool or DaVinci Resolve does show a difference in whether lens corrections are enabled or not (and there's no obvious way to change the setting in either of those programs). However, if you load the same raw video into Canon's Digital Photo Pro, you can toggle the lens corrections on the file and the preview images do change.
So what it looks like to me is that raw videos technically behave the same way as raw stills in how they're implemented (pixel data isn't messed with, metadata for all corrections is saved and used in the post process stage where the raw data is converted to a usable YCC/RGB image). However, on the software side, at least for Resolve and Canon's cinema tool, there's no control over overriding lens aberration corrections (this might be different in Premiere) so it seems like you have to set that on the camera the way you want it to be in post.
That said, I don't have a huge amount of experience with working with raw video yet. Digging in to the ins and outs of it is certainly on my to do list, but since it's not a format I need to use regularly it hasn't been a huge priority.
Hope that helps.
@@PointsInFocus Thank you so much for your prompt, very intelligent and clear reply! I think everybody can really appreciate the effort and diligence you put into your research for your presentations.
I really didn't know the effects of enabling the in-camera corrections for the RAW LT video files, since most of the posts online are referring to the photo RAW files and not the video ones. So you've shed light on some of my unanswered questions for sure. For now I'll keep the in-camera lens corrections enabled for when I shoot video, but not when I shoot stills (I only shoot RAW when I shoot stills). Oh, and I do use Davinci Resolve.
Thank you again for your hard work and consideration for your followers!
Hmm. So I don't see the point in shooting jpeg at all.
I've recently purchased a 14-35 to use with r6 and having great difficulty with distortion.
I have the latest version of camera raw for Photoshop with correct lens profile selected, and find I need different distortion correction amounts depending on the image, and how close I am too walls/size of rooms etc (for real estate photography.
A little disappointing at this point.
Any thoughts ? Thanks for the info.
Didn't seem to have this problem at all with ef16-35.
As for the 14-35. Unfortunately, there's no great solution for that lens. It's designed to rely on post processing distortion correction instead of minimizing distortion optically. This of course puts you at the mercy of the correction profiles. Additionally, since the lens changes focal length with focus position (e.g. breathing), that can impact just how well the distortion correction fixes things - which is probably why you're having to make tweaks based on focus distance.
One thing you could try is creating your own correction profiles (See helpx.adobe.com/camera-raw/digital-negative.html#Adobe_Lens_Profile_Creator). At a minimum that would get you a profile that's tailored to your specific lens, at a working distance that's more in line with your usage instead of whatever Adobe used.
@@PointsInFocus thank you. I tend to just use equipment rather than understanding the optics entirely.
Do you think the distortion is based more so on focusing distance than zoom ? Or does zooming also effect it.
I tested it on rp this morning and it seemed pretty good on stock camera raw profile.
Perhaps since I shoot wide with everything in focus I could try not to adjust focus point when shooting real estate.
Appreciate your input :)
It's primarily due to the zoom (focal length), with the widest end having the most distortion on that lens. Focusing will have a comparatively small impact, but it's probably enough to be noticeable when you have a lot of straight lines you need to keep straight. Either way, I think you'd need to either build a custom profile or tweak the default correction settings to get a consistent result.
If you're doing this professionally, you might want to consider either upgrading to the 15-35/2.8. The RF 15-35/2.8L's optical design controls distortion much better, so it's much less reliant on software corrections.
Alternatively, for architectural work there's no real downside (at least optically or performance wise) to using an EF lens on an EF-EOS-M mount adapter; and if it gets you the images you need, there's a lot of upsides to that over fighting with a less than optimal lens that requires more work in post. So if you still have your EF 16-35, you might want to consider just going back to using that.
@@PointsInFocus hmmmm... Ok - I have a 2 week period to send the lens back.
16mm is enough. I bought this so I could have two sets of lenses, cameras etc to fail proof me.
Righto. I shall consider. But yes, stuffing around with distortion control in camera raw for almost every image is not a good thing.
Ok thanks.
what correction applies to Jpg but not applies to raw file ?
Simple answer: All corrections apply to JPEGs, and no corrections are applied to the raw files.
More complex answer: JPEGs will be processed in camera to apply all of the corrections you've enabled.
Raw files will store what corrections are enabled as metadata, and Canon's software will automatically apply whatever settings you had enabled in the camera when you load the raw files. You can also turn them on and off in canon's software after the fact. 3rd party software (Lightroom, Photoshop, Capture One, etc.) typically ignore the metadata settings for lens corrections.
@@PointsInFocusirst of all, thanks for the video! I only shoot RAW and edit it with Lightroom, applying the lens correction in there.
I also had the lens distortion correction enabled in camera, but I just found out that for the focus point to show up on the playback mode, I have to disable the lens distortion correction.
Based on your comment, I understand that since I use the lens correction on LR, it doesn't matter if I do it before in camera or not. Am I correct?
Thanks again!
Yes, you're correct it doesn't matter if you apply lens corrections in camera if you're shooting raw and processing in Lightroom.
Re the focus point not showing up in review. I've never seen that behavior on my cameras. I leave everything but Digital Lens Optimizer enabled, and I see the AF point in playback mode. What lens are you using?
And also are you using rear button focusing? If yes, then the camera doesn't show the focus point's position unless the AF-On button is also held down when the shutter is released.
@PointsInFocus thanks for answering! I tried it with the Canon 17-40mm. Yes, I use the back button focusing, but even with it pressed, if the distortion correction is enabled, it doesn't work.
I read it's because the camera applies the correction. Therefore, the original focus point is shifted, so that's why it doesn't show up.
I'll leave the distortion correction disabled from now on.
Thanks again!
You say corrections are available for all RF lenses, but I think you mean for all Canon RF lenses, not for third party lenses.
That's correct. Canon only has profiles for the products the make, correcting 3rd party lenses is up to you and your post processing software.