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This is from canon-europe...
* Some examples of a dark environment are as follows:
1. When the body cap is attached
2. When the lens cap is attached
So then I took it outdoors and found that, in the viewfinder, you can't see the red flash on an AF point when it's focussed! That's a serious issue for me.
I really would like to know how many people would have noticed this flaw on their own, not reading about it on the web. So the Internet ruined it all!
What many has it been confirmed by? So far I have seen one person say that he found a difference with the lens cap off and it ONLY occured at EV1, the absolute bottom limit of the metering performance range, where it underexposed by 1/3 of a stop.
That sounds like me you're referring to, and you're making the situation sound significantly worse than what I discovered.
Set the camera in manual mode to EV 1 (1" @ f/1.4 @ ISO 100), and find a dark corner of a dark room to point to until the meter bug is centered. Turning the LCD backlight on and off will not budge the meter at all. This is the bottom of the specified range of the 5DIII meter.
Set it to EV 0 and the backlight still won't change the exposure.
At EV -1, the backlight moves to the right by 1/3 stop when you turn it on...but you can't say that it's causing underexposure at that point because it's operating outside of its design parameters and may well already be off by some unknown and unspecified amount in either direction.
At EV -2, the backlight still only makes the meter move 1/3 stop to the right.
At EV -3, the backlight makes the meter bounce between 1/3 and 2/3 stops.
At EV -4, the backlight makes the meter move solidly on 2/3 stops to the right...and you're five stops below the bottom of the meter's range (30" @ f/1.4 @ ISO 100) and basically in the dark. There's no way the meter's readings are reliable, with or without the backlight on. Any photographic meter -- not just the one built in to the camera.
If you're actually photographing in conditions even as dark as EV 1...well, either you're doing long-exposure tripod work, maybe of the nighttime skyline, and you know full well that your meter is already useless...or you're being silly showing off your new toy outside at night away from the lights, and probably shooting at ISO 25,600 or something ludicrous and you know the results, though surprisingly not bad, will be totally useless for anything serious. And at EV -2 when the "problem" actually starts to appear, and only at a third of a stop? We're talking moonlit landscape photography, where no sane person even thinks to have a look at the meter. Hell, you're probably thinking of shooting in bulb mode with a stopwatch in those conditions....
Cheers,
b&