Any evidence of the 5D3 underexposing in AV and M (flash)?

Started Dec 23, 2012 | Discussions
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canon person Senior Member • Posts: 1,547
Any evidence of the 5D3 underexposing in AV and M (flash)?

I find it necessary to add 1/3 or 2/3 additional exposure in both AV and M (flash) mode with my new 5D3.   Anyone else experiencing similar underexposure? Thanks.

Canon Person

Canon EOS 5D Mark III
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RedFox88 Forum Pro • Posts: 25,115
Re: Any evidence of the 5D3 underexposing in AV and M (flash)?

canon person wrote:

I find it necessary to add 1/3 or 2/3 additional exposure in both AV and M (flash) mode with my new 5D3.

Av mode  your flash will work as a fill-in flash, in M mode the flash will provide enough light based upon the ISO, shutter speed, and aperture selected.  ISO 400 is a good starting point for M use with flash and possibly 800 since the ISO is so good.

canon person OP Senior Member • Posts: 1,547
To RedFox:

Thank you for your reply.  Perhaps I was unclear.  I meant to say that in AV mode (non-flash) OR if Flash (M mode), I have the issue.  Perhaps that helps.

Thanks again.

Canon Person

Brian de Cambra Contributing Member • Posts: 526
Re: Any evidence of the 5D3 underexposing in AV and M (flash)?

Hi Canon Person, yes, I have found that in AV there is a tendancy to underexposed by about a third, however I have not had time to check this out thoroughly. AV is my default mode therefore this is where I have noticed it. I will try to do some more tests later today and get back to you.

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Brian

Nigel Wilkins
Nigel Wilkins Senior Member • Posts: 1,006
Re: Any evidence of the 5D3 underexposing in AV and M (flash)?

On the 5DII, I found flash exposure to be more accurate if the flash exposure metering was set to average rather than evaluative.  It may be worth a try changing this in the External Speedlite Control settings to see if it results in better metering for your circumstances.

rndman Senior Member • Posts: 1,595
Re: Any evidence of the 5D3 underexposing in AV and M (flash)?

canon person wrote:

I find it necessary to add 1/3 or 2/3 additional exposure in both AV and M (flash) mode with my new 5D3. Anyone else experiencing similar underexposure? Thanks.

Canon Person

I believe I saw experienced this (need more tests to confirm) that in M mode, it underexposes. The AutoISO also does not function very well. It keeps on selecting ISO 400..

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Rokinon 14mm F2.8 IF ED MC Rokinon 8mm F3.5 Aspherical Fisheye
The Lazy Photographer Junior Member • Posts: 49
Re: Any evidence of the 5D3 underexposing in AV and M (flash)?

canon person wrote:

I find it necessary to add 1/3 or 2/3 additional exposure in both AV and M (flash) mode with my new 5D3. Anyone else experiencing similar underexposure? Thanks.

Canon Person

I'm experiencing the same thing. In some cases I've had to increase my exposure comp. by +1! Really sucks because in doing so my shutter speed drops accordingly (in Av) and I have to up my ISO to recover the shutter speed.

On the T2i the problem was the other way around, which really wasn't a problem at all. I'd have to set my exposure comp. to -1/3 to -2/3 to get proper exposure.

The results, for me, is that I'm having to shoot in low light at ISO 6400 shots that I would have gotten at ISO 3200 or even 1600 on my T2i.

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Dave
Blog: http://www.lazyphotographer.ca
Gear: Canon 5D Mrk III and 24-105 F4 L Glass
Canon T2i (550D) | Tamron 17-50mm F2.8 VR | Tokina 11-16mm F2.8 wide angle | Canon 55-250mm F3.5-5.6 telephoto

rndman Senior Member • Posts: 1,595
Re: Any evidence of the 5D3 underexposing in AV and M (flash)?

The Lazy Photographer wrote:

canon person wrote:

I find it necessary to add 1/3 or 2/3 additional exposure in both AV and M (flash) mode with my new 5D3. Anyone else experiencing similar underexposure? Thanks.

Canon Person

I'm experiencing the same thing. In some cases I've had to increase my exposure comp. by +1! Really sucks because in doing so my shutter speed drops accordingly (in Av) and I have to up my ISO to recover the shutter speed.

On the T2i the problem was the other way around, which really wasn't a problem at all. I'd have to set my exposure comp. to -1/3 to -2/3 to get proper exposure.

The results, for me, is that I'm having to shoot in low light at ISO 6400 shots that I would have gotten at ISO 3200 or even 1600 on my T2i.

-- hide signature --

Dave
Blog: http://www.lazyphotographer.ca
Gear: Canon 5D Mrk III and 24-105 F4 L Glass
Canon T2i (550D) | Tamron 17-50mm F2.8 VR | Tokina 11-16mm F2.8 wide angle | Canon 55-250mm F3.5-5.6 telephoto

I think this is a candidate for FW fix..

 rndman's gear list:rndman's gear list
Rokinon 14mm F2.8 IF ED MC Rokinon 8mm F3.5 Aspherical Fisheye
motifone Regular Member • Posts: 109
Re: Any evidence of the 5D3 underexposing in AV and M (flash)?

I need to test this more myself, but coming from the 5D classic and now shooting on the 5D III (both in manual), I do feel the 5D III captures from manual tend to feel a bit unexposed, compared to my experience on the original 5D -- also confirmed by the histogram.  I need to do some controlled tests shooting the same subject/situation with both the 5D and 5D III to really confirm any discrepancies. My 5D III does not have the light leak problem either.

The previous poster mentioned a FW fix -- is that a firmware fix? Can you clarify?  Mine is using firmware 1.1.3

rndman Senior Member • Posts: 1,595
Re: Any evidence of the 5D3 underexposing in AV and M (flash)?

motifone wrote:

I need to test this more myself, but coming from the 5D classic and now shooting on the 5D III (both in manual), I do feel the 5D III captures from manual tend to feel a bit unexposed, compared to my experience on the original 5D -- also confirmed by the histogram. I need to do some controlled tests shooting the same subject/situation with both the 5D and 5D III to really confirm any discrepancies. My 5D III does not have the light leak problem either.

The previous poster mentioned a FW fix -- is that a firmware fix? Can you clarify? Mine is using firmware 1.1.3

I said it is a candidate (for canon to work on) a firmware fix..

 rndman's gear list:rndman's gear list
Rokinon 14mm F2.8 IF ED MC Rokinon 8mm F3.5 Aspherical Fisheye
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