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FORUMS Canon Cameras, Lenses & Accessories Canon EOS Digital Cameras 
Thread started 11 Feb 2014 (Tuesday) 02:17
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Quick question regarding ALO

 
CaPpedDoG
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Feb 11, 2014 02:17 |  #1

Does having Auto Lighting Optimizer enabled change the shutter speed automatically in manual mode (with auto ISO)?

Edit: Wondering if it's normal for the shutter speed to change slightly with ALO enabled in manual mode with auto ISO. Anyone?




  
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apersson850
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Feb 11, 2014 02:30 |  #2

No, it works on the image like postprocessing does.
If you shoot RAW you can apply it in post completely.


Anders

  
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Feb 11, 2014 02:40 |  #3

Thanks for the quick reponse. The reason I'm asking is because I recently enabled it and have now noticed my shutter speed automatically fluctuating in manual..... I will set it to say, 1/50 and it drops down to 1/40; alternating back and forth.




  
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Feb 11, 2014 03:52 |  #4

That sounds as if you are maxing out on the ISO and have safety shift enabled. Remember that if you select AutoISO then you are nolonger shooting in manual, but a semi auto mode with the shutter and aperture as the fixed variables. Just like Av and Tv (without AutoISO) have the ISO fixed along with either the aperture or shutter speed. The only disadvantage to this mode is there is no Exposure Compensation available unless you are shooting the V2 firmwear in a 1Dx. None of this has anything to do with using ALO.

Alan


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CaPpedDoG
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Feb 11, 2014 10:18 |  #5

BigAl007 wrote in post #16680461 (external link)
That sounds as if you are maxing out on the ISO and have safety shift enabled. Remember that if you select AutoISO then you are nolonger shooting in manual, but a semi auto mode with the shutter and aperture as the fixed variables. Just like Av and Tv (without AutoISO) have the ISO fixed along with either the aperture or shutter speed. The only disadvantage to this mode is there is no Exposure Compensation available unless you are shooting the V2 firmwear in a 1Dx. None of this has anything to do with using ALO.

Alan

Appreciate the reply. Doing some more testing this morning, I am not maxing out the ISO. This change in the shutter speed only happens with ALO enabled; no change whatsoever with it off. This is with a 1DX.




  
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apersson850
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Feb 11, 2014 14:26 as a reply to  @ CaPpedDoG's post |  #6

Never seen this. I'll have to see if I can provoke it to happen.


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Feb 11, 2014 16:59 |  #7

apersson850 wrote in post #16681635 (external link)
Never seen this. I'll have to see if I can provoke it to happen.

Yea it seems strange. Then again, I've never used ALO in the past. Like I said before: happens in manual mode, with auto ISO. It doesn't do it all the time. Seems to happen more when I point it at shadows/dark objects.




  
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Feb 13, 2014 13:16 |  #8

Anyone else notice this?




  
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Quick question regarding ALO
FORUMS Canon Cameras, Lenses & Accessories Canon EOS Digital Cameras 
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