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View Full Version : Canon 40D Live View Overheat?



scalesusa
November 23rd, 2007, 10:40 PM
I am new to using DSLR Remote Pro, I recently aquired a canon 40D to use the remote capture with live view feature and it works great, except ...

At seemingly random times, but usually after I've had live view activated on my camera for a few minutes, the live view image gets alternating light and dark horizontal bands that fluctuate. I've tried a different USB Cable and also tried the Canon Remote capture software, the same thing happens with both.

Has anyone had this problem? It does not seem to affect the capture or the photograph, but it is very difficult to view and focus when it is doing this.

Turning off live view for a few minutes sometimes helps, but not always. I work in a normally cool area with flourescent lighting, so there is no added heat, just what the camera generates. I discharge the batteries pretty quickly using live view, so a lot of power is being consumed.

I may try buying and using a external adapter to see if that helps, just in case battery voltage is fluctuating due to continued heavy draw.

I have found that placing the camera in the manual exposure setting, first focusing and composing, then placing the camera in depth of field preview mode lets me adjust the aperture, shutter speed and ISO setting to get a correctly exposed photo every time. I can highlite the setting and roll my mouse wheel forward or backwards and watch the lighting change until its just right. The camera auto exposure setting is pretty variable, but by using the DOF preview I can get it right every time. This is one of the best time saving features for me.

Chris Breeze
November 26th, 2007, 09:02 AM
I haven't had any problems with live view so far with the 40D, 1D Mark III or 1Ds Mark III. I've enabled live view exposure simulation (CFn IV:7) on my 40D. During testing I had live view running for an hour or more at a time.

scalesusa
November 28th, 2007, 02:25 AM
I bought a AC adapter yesterday, and used it for a couple of hours last night without the problem cropping up, so it may be the battery afterall.

I have not been keeping track of the battery usage after each recharge, I have two batteries that I rotate, and after about 100 shots over 2-3 hours using live view, they are discharged. This is not even remotely close to the battery life in normal photography, I do not have the camera continuously turned so the 2-3 hours is a estimate of the total "ON" time.

I'll add more after I get several hours of usage logged with the AC adapter.

scalesusa
December 21st, 2007, 05:42 AM
After lots of additional usage, the problem seemed to be gone, then it cropped up again while using the AC adapter. It is possible that I am getting flicker from the flourescent tubes, or electrical interference. It does not seem to affect the photos, so I just put up with it.