I forgot about this and it is probably responsible for the couple of times it happened to me. I'll remember to check next time.
yep thats a good point . the meter of a DSLR is in the prism area so light coming in thru the VF will have a big effect. sticking your eye to the VF blocks out most of the light
dont the 1 series bodies come with a blind to close the VF? lesser bodies come with a rubber piece to cover the eye piece . .
boingyman wrote:
I'm guessing it's user error you're not aware of; possibly metering issues. Shoot in manual without auto ISO and let us know if this still occurs.
+1. Try to reset the custom functions etc to defaults. No one else has had this issue with auto iso going nuts, so try this first before sending it in to Canon.
With Pro bodies you can save your settings to a Card. Always have a old small card around to have a back up while on vacation. Hard to remember all the settings on the camera. The 1Dmk4 has a few! So save a copy of your settings and then as suggested reset to defaults. Configure again and test it out. You can always reload to before from a saved settings later.
Ian.Dobinson wrote:
yep thats a good point . the meter of a DSLR is in the prism area so light coming in thru the VF will have a big effect. sticking your eye to the VF blocks out most of the light
dont the 1 series bodies come with a blind to close the VF? lesser bodies come with a rubber piece to cover the eye piece . .
It seems to me that extraneous light entering the eyepiece would if anything cause underexposure. It's affecting the metering, not "fogging" the sensor. I agree that it's advisable to use the eyepiece blind when shooting on tripod, eye away from camera.
I forgot about this and it is probably responsible for the couple of times it happened to me. I'll remember to check next time.
No way. Light coming in through the viewfinder and manipulate metering would cause an underexposed image not an overexposed one!
I guess your autoiso was/is not working correct. 4.0, 1/60th and ISO 12K is good enough for a camdle light portrait but imo never needed for a daylight shot how cloudy the day might be. ISO 400-800 should be fast enough and here you have your five stops.
Addition:
Ups! Sorry Photon: Read your comment later and saw you already mentioned my first statement.
I've had random over exposure issues with my 1Dx. Just this Saturday i was shooting a kids soccer game. My settings were Av, f\8, ISO 800, Average shutter speed with these settings was between 1600- 2500 sec. On the over exposure all settings remained the same except the SS dropped down to 350. I have noticed this on various occasions. By the way, it was a sunny bright morning with temps in the high 80's with the sun at my back. Looking back at the other random over exposures i noticed the same thing, the SS dropping down unexpectidly. By the way the light source didn't change to cause this. It was always in the bright sun so cloud cover didn't force the ss change. Since it's so random, i have decided to wait until my Warantee period is almost up before bringing it to the new CPS facility in NJ. The lens that i was shooting with was the Canon 28-300L. I noticed the same thing happening on occasion with the 1Dx and the 600 vII which seemed to have straightened itself out ( refering to a previous post when i first got the 600 ). Surprised no one else has this problem. Maybe the new firmware download will clear it up. If not, It'll be visiting Canon soon.
