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Canon R5 RAW files very dark

Steve Kelly

Hi there,

RAW files for the Canon R5 are importing very dark, all the R5 RAWs that I have imported into CO20 so far have required a half-to-full stop exposure increase (most nearer a full stop) to get to looking anywhere near what it should be.  These images all exposed correctly as per the R5 evaluative metering, and look good on the camera screen/EVF, but then when import them into CO20, they are under-exposed a significant amount.

Can you please look into this.

Thanks

Steve.

 

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5 comments

Date Votes
  • SFA

    Steve,

    What does the C1 Exposure Evaluation tool histogram show? It should give some indication of whether it thinks they might be under exposed. From that there may be some clues, if they are all much the same, about what is happening.

    On the camera screen I assume you are effectively looking at the in-camera processed jpg rendition of the RAW file, one way or another. There is some potential for difference I would guess.

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  • Steve Kelly

    Thanks for this, SFA!  I wasn't aware of the EE tool - just had a look and most of the images are under by half to a full stop. All quite similar.  Great tool though!

    Yes I mean the jpg rendition of the RAW file.  Though I quickly realised to worry less about this aspect of it, and more that the camera metering was showing as 'bang on/exposed correctly'. 

    I will do some more thorough tests today, including a good run of shots with Exposure Simulation in camera turned off, and make sure I am hitting the metering's exposure assessment exactly.

    Thanks again for input, will add info more later.

     

     

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  • Steve Kelly

    Did some more test shooting in daylight this morn, and whilst not quite as bad as yesterday, all images are (at best) still coming out as 'slightly under perfect exposure'.

    A significant part of the issue seems to be Light Falloff. With the exception of the RF50mm, none of the RF lenses that I have are supported natively in CO20 yet (though they've all been requested for months, running into years!).  And the light falloff in the untouched R5 RAW files is very significant in many (though not all) cases.

    And what I noticed is, unlike with the Exposure tools in CO, when you apply some Light Falloff changes in the Lens Correction tool, it actually changes the reading in the Exposure Evaluation tool

    i.e. when I increase the Light Falloff (and lose the harsh vignette), the value reading in Exposure Evaluation tool is increased too.

    So I think if/when the RF lenses gets supported, and CO can do these corrections automatically, that will help a lot.

    As it is, it is easily fixed manually per image, but i really don't want to HAVE to do it all the time, for every image, if you know what I mean.

    I'd best open a support ticket with them about this under exposure thing (they already have requests for the lenses).

    Thanks.

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  • SFA

    Steve,

    I think you should be able to set a default for correction of the light fall off on a per-lens basis (from memory. I would need to check to be absolutely certain that it does not affect anything else.)

    However the effects usually change with lens settings and that is where some of the profiles come in.

    I am a little surprised that you have not mentioned Canon "Manufacturer" profiles. Do they not provide any? All the other manufacturers seem to be doing so in recent years. Obvious not for older lenses but most mirrorless have relied on software fixes for compromised lens designs due to the need for low cost and low weight with small size. Perhaps that is not quite as prevalent for the larger bodies.

    All my primary stuff is EF mount so not likely candidates for build in lens correction - much too old!

    Exposure simulation or any other forms of in camera processing that might enhance things for jpgs and the camera's screen/EV could also be a factor depending on whether the camera auto applies the corrections. Something like the old time Exposure Compensation adjustments that one could apply to assist the light meters.

    However your light fall-off description does not sound like a good fit for such an explanation based on my limited knowledge of the build in facilities.

    I'll be interested to hear about what you discover.

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  • SFA
    • Edited

    Just a couple of additional thoughts.

    The EE tool histogram reports after taking into account the Base Characteristic settings. So to see the absolutely least adjusted RAW data check how Linear Response looks.

    Linear is basically just enough data interpretation to provide something that should look like a photo!

    The online help for EE suggests that ONLY Base Characteristics setting have any influence over the EE evaluation but in fact the Lens tool Light Falloff adjustments are also factored in to the Histogram(but not the Exposure assessment)  and there may some other factors applied at a similar base interpretation level that cold be applied. For example I'm not sure about ICC profiles - it's been a while since I have needed to play with them.

     

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