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Light Falloff not corrected with automatic lens corrections

don maclean
I raised a support request about Light Falloff still appearing on images from a Canon 5DsR/70-200mm f/2.8 IS II which is a prime lens.

You can see the comparison here: https://photos.app.goo.gl/07CsbgpS6pbMBp5t2 with Lens Corrections at 0% and then with falloff set to 100%.

And the response I received from support says that it is OK because the slider is set to 0%.

"Lightfall off is at zero which it should be by default.

You can can twaek this which will fix light fall of which is only a matter of density difference toward the side and does not change colour, in other words it change exposure loss and not hue."

I am frustrated by the lack of response from Support as I shouldn't have to "tweak" each and every image to get a properly corrected image especially from a prime lens.

If anyone else is having a problem with Light Falloff on lens corrections please post here as it is a frustrating issue when you have to tweak lens corrections.
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  • Permanently deleted user
    I have the feeling that you are confusing things a little bit. First, the "70-200" lens you're talking about is obviously a zoom and not a prime.

    Second, no. The falloff correction should not be on by default. Distortion and falloff varies throughout the zoom, and falloff also with the light input. AFAICT no preset or algorithm can put that together accurately, so I think it's better this way.

    You can very easily use the sliders to your taste and create a tool preset, that can be applied to all images you want. I would recommend, however, keeping in mind the lens and the specific focal length before creating a shoddy universal profile.

    So yes, you do have to tweak it; but it's not all the bother you make it sound like.

    Hope it helps,

    -Gus
    -1
  • don maclean
    [quote="gusferlizi" wrote:

    Second, no. The falloff correction should not be on by default. Distortion and falloff varies throughout the zoom, and falloff also with the light input. AFAICT no preset or algorithm can put that together accurately, so I think it's better this way.


    I'm sorry but lens corrections actually correct the light falloff through the zoom range and in this particular case the LC's for the zoom lens (as you correctly pointed out but it is a prime cannon zoom) correct over the full range. If you use other products the light falloff is automatically corrected ... in my case with C1 this is the only affected lens and others are fine.

    Should you wish to read a simple explanation of lens imperfections and automatic corrections ... try this:

    http://www.cambridgeincolour.com/tutori ... ctions.htm

    And just so you are aware ACR corrects the light falloff automatically, as do other products, as you can see here:

    https://photos.app.goo.gl/lqeaH3Ge1C2dRInr2
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  • Christian Gruner
    What Support have explained to you is indeed correct. This is by design, as correcting it by default changes the look of the image considerably
    If you would like it changed, you are most welcome to file a Feature Request with our support team.

    Also Remember that you can batch apply the fall off correction to all your images at once.
    -1
  • don maclean
    [quote="Christian Gruner" wrote:
    What Support have explained to you is indeed correct. This is by design, as correcting it by default changes the look of the image considerably
    If you would like it changed, you are most welcome to file a Feature Request with our support team.

    Also Remember that you can batch apply the fall off correction to all your images at once.


    Thanks Christian, it is just that it is only significant on that particular lens ... and it seemed to be different in v8 especially in portraits as I have to batch a rerun for a client. Anyway I guess I will have to live with it in C1.
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  • Permanently deleted user
    [quote="AiDon" wrote:
    [quote="gusferlizi" wrote:

    Second, no. The falloff correction should not be on by default. Distortion and falloff varies throughout the zoom, and falloff also with the light input. AFAICT no preset or algorithm can put that together accurately, so I think it's better this way.


    I'm sorry but lens corrections actually correct the light falloff through the zoom range and in this particular case the LC's for the zoom lens (as you correctly pointed out but it is a prime cannon zoom) correct over the full range. If you use other products the light falloff is automatically corrected ... in my case with C1 this is the only affected lens and others are fine.

    Should you wish to read a simple explanation of lens imperfections and automatic corrections ... try this:

    http://www.cambridgeincolour.com/tutori ... ctions.htm


    And just so you are aware ACR corrects the light falloff automatically, as do other products, as you can see here:

    https://photos.app.goo.gl/lqeaH3Ge1C2dRInr2


    Again, a zoom lens is not a prime lens. Maybe you mean 'premium' for the Canon "L" and red ring. Prime lenses have only one focal length.

    That Lightroom example shows my point. The vignette is still there!

    From Cambridge in Colour:
    "Caused by the inner workings of your particular lens and camera. It's typically most apparent at lower f-stops, with zoom and wide angle lenses, and when focusing on distant objects."


    Too many variables to accurately correct for with a universal profile.
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  • don maclean
    [quote="gusferlizi" wrote:

    That Lightroom example shows my point. The vignette is still there!


    Well my eyes must be really bad, C1 has vignette on the top and I can't see any on the bottom which is LR. Anyway the issue has been explained by Christian. Finished!

    And you are right about the Canon terminology, Wide Angle, Premium Telephoto and Prime.
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  • Permanently deleted user
    [quote="AiDon" wrote:
    [quote="gusferlizi" wrote:

    That Lightroom example shows my point. The vignette is still there!


    Well my eyes must be really bad, C1 has vignette on the top and I can't see any on the bottom which is LR. Anyway the issue has been explained by Christian. Finished!

    And you are right about the Canon terminology, Wide Angle, Premium Telephoto and Prime.


    It is far less pronounced, but fair enough. Hope it works out however you mitigate it.

    Cheers,

    -Gus
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  • Christian Gruner
    [quote="AiDon" wrote:
    [quote="Christian Gruner" wrote:
    What Support have explained to you is indeed correct. This is by design, as correcting it by default changes the look of the image considerably
    If you would like it changed, you are most welcome to file a Feature Request with our support team.

    Also Remember that you can batch apply the fall off correction to all your images at once.


    Thanks Christian, it is just that it is only significant on that particular lens ... and it seemed to be different in v8 especially in portraits as I have to batch a rerun for a client. Anyway I guess I will have to live with it in C1.


    You can filter, using the Filters Tool, on lenses in the collection. Then you select all shots from that particular lens, and only apply the correction to those.
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