Rumors > EOS Bodies
5D MK 3 and auto ISO
Tcapp:
--- Quote from: Bosman on May 02, 2012, 01:57:07 AM ---
--- Quote from: Tcapp on April 30, 2012, 09:01:14 PM ---
--- Quote from: EvilTed on April 30, 2012, 08:21:56 PM ---BTW, why would anyone shoot hand held with a 1.2 lens in dim light and use a flash?
Feels like washing your feet with your socks on to me?
ET
--- End quote ---
Really? So you can balance your flash to the ambient light and capture a more natural photo. The flash helps freeze the motion. I do it ALL the time at dark wedding receptions.
--- End quote ---
+1 Flash give color pop! just use flash as fill even in dim situations.
--- End quote ---
You and me Bosman, we are on the same page here. :)
Long live the fast prime!
sarangiman:
I just noticed:
In M mode, whether the flash is in 'bounce' mode or not, Auto ISO locks ISO at 400.
In A/Tv modes, Auto ISO operates between ISO 100-400.
In P/A+ modes, Auto ISO operates between ISO 100-1600.
Is it just me, or does that seem as nonsensical & inconsistent to you as it does to me?
Fatalv:
From what I'm reading above I think I'm having issues with my 5DMK3 and 600EX-RT.
When using Av/Tv modes the camera chooses settings without taking into account the flash (flash is set to ETTL mode). At first I wondered why my shots were blurry then looked at the exif data and the shots were taken @ 1/8th :(
I need to do some more testing but is anyone else experiencing this?
neuroanatomist:
--- Quote from: Fatalv on May 16, 2012, 02:35:55 PM ---From what I'm reading above I think I'm having issues with my 5DMK3 and 600EX-RT.
When using Av/Tv modes the camera chooses settings without taking into account the flash (flash is set to ETTL mode). At first I wondered why my shots were blurry then looked at the exif data and the shots were taken @ 1/8th :(
I need to do some more testing but is anyone else experiencing this?
--- End quote ---
I think you can stop testing. There is no 'issue' here, other than user error. What you state is normal in Av mode - exposure metering ignores the flash because the intent is to expose the ambient (background) properly, then your flash fires a pre-flash which determines the flash power needed to properly illuminate the subject (ETTL). If you want a faster shutter speed, in the flash control menu you can set the shutter speed in Av mode to 1/200-1/60 s or 1/200 s fixed (instead of the default, which is Auto). See p. 192 of your manual, or p. 363 where this exact 'problem' is addressed in the troubleshooting guide. Changing that setting to a faster shutter speed will mean more of the light will be coming from the flash, which means the background will be underexposed, etc.)
Note, you state this occurs in Av/Tv mode - if you're getting 1/8 s exposures in Tv mode without setting that shutter speed yourself (which is the point of Tv mode - you, not the camera, are setting the shutter speed), you do indeed have an issue.
Fatalv:
--- Quote from: neuroanatomist on May 16, 2012, 02:52:47 PM ---
--- Quote from: Fatalv on May 16, 2012, 02:35:55 PM ---From what I'm reading above I think I'm having issues with my 5DMK3 and 600EX-RT.
When using Av/Tv modes the camera chooses settings without taking into account the flash (flash is set to ETTL mode). At first I wondered why my shots were blurry then looked at the exif data and the shots were taken @ 1/8th :(
I need to do some more testing but is anyone else experiencing this?
--- End quote ---
I think you can stop testing. There is no 'issue' here, other than user error. What you state is normal in Av mode - exposure metering ignores the flash because the intent is to expose the ambient (background) properly, then your flash fires a pre-flash which determines the flash power needed to properly illuminate the subject (ETTL). If you want a faster shutter speed, in the flash control menu you can set the shutter speed in Av mode to 1/200-1/60 s or 1/200 s fixed (instead of the default, which is Auto). See p. 192 of your manual, or p. 363 where this exact 'problem' is addressed in the troubleshooting guide. Changing that setting to a faster shutter speed will mean more of the light will be coming from the flash, which means the background will be underexposed, etc.)
Note, you state this occurs in Av/Tv mode - if you're getting 1/8 s exposures in Tv mode without setting that shutter speed yourself (which is the point of Tv mode - you, not the camera, are setting the shutter speed), you do indeed have an issue.
--- End quote ---
Thanks for the info Neuro. It was one of those moments when I needed to grab a shot real quick so I flipped into Av. I usually shoot all Manual but have been experimenting with Av/Tv lately for times like this where I can't preset the shot up. I'll double check the Tv issue when I get home but it's likely more user error on my part ;)
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