Rumors > EOS Bodies
The Light Leak Issue
AUGS:
--- Quote from: justsomedude on April 09, 2012, 12:56:26 PM ---From the video previously posted by "highnfar," here are screen caps of images taken with the backlight on during metering, and backlight off during metering....
:o
--- End quote ---
Yes, I agree I can see a visible difference between the images. But which image is the correct exposure for the scene and what you are trying to achieve? Without a review of the histograms and images, neither may be correct, and for night photography nor should they be assumed to be correct. (FWIW, the image on the right looks over-exposed, but its almost impossible to tell from such a small grab - and I do know the left is the LCD affected exposure.)
I'm not saying there isn't a problem, there clearly is but it looks to be manageable. In my experimentation, I've found that the only time the exposure is affected is when the LCD panel in is brighter light than the image to be captured and how much it is affected depends on the intensity difference.
With this knowledge in hand we are forewarned and hence forearmed and can work around it - albeit we shouldn't and I wish we didn't have to, but it is what it is at the moment. :(
My workflow for night photography will not change:
1. Compose the image and set focus.
2. Set a high ISO, Aperture Priority, biggest aperture for the lens, set autobracket +/-1 stop.
3. Review the 3 histograms and images.
4. Switch to Manual mode, with same ISO, same aperture, and adjusted time based on review of previous images and the result I want to achieve.
5. Confirm adjusted exposure by creating another image or adjust again. Determine Bulb exposure time for desired ISO and desired aperture.
6. Set bulb setting, start exposure, grab a coffee, plug in the iPod and wait.
The good news is I've confirmed (on my 5D3 at least) that the light leakage does not get to the image sensor when the mirror is up, so the activation of the LCD or the use of a head-torch or similar during the exposure doesn't affect the image. :)
bp:
People are still screaming about this? Seriously? Yes yes, this is a HUGE PROBLEM!!!!!!!!!!!!
IF you're doing near pitch-black landscape photography
AND you're relying on the meter to figure out your exposure for you
AND you've put the camera in a place where you can't use the rear LCD
AND you're not willing to wait to execute the exposure until after the LCD backlight turns off
I don't do much nighttime landscape / astrophotography - but when I have, I've never once relied on the camera's metering system. That's what M mode and a few test shots are for. Why all the drama?
Martin:
Please could you check metering in normal use? I had very annoying problem with 5D2 which underexposed by 2/3 stop all the time. I did a white(gray) wall test with all different mattering modes and histogram against white or gray card was off to the left by 2/3 stop. it's not normal behaviour as it should be set dor 18% gray, so the histogram peak should be perfectly in center. Please check if 5d3 is also affected by this issue.
kozakm:
FYI: 1D X is ok, no light leak problem (tested)
javier:
--- Quote from: altenae on April 08, 2012, 02:21:12 PM ---
--- Quote from: javier on April 08, 2012, 02:05:34 PM ---
--- Quote from: prestonpalmer on April 08, 2012, 01:49:11 PM ---I am glad you recognized that light leaks through thumbs! Good catch. Since my 5D2 acts the same way, im gonna say NO ISSUE here!
Now, back to wedding photography.
--- End quote ---
What about the 2/3 stop off in normal use of the camera.
--- End quote ---
Javier, If you think it is the camera, return it.
My friend and I do NOT have 2/3 stop off in normal use.
--- End quote ---
I told you.... http://www.usa.canon.com/cusa/registration/professional/professional_cameras/digital_slr_cameras/eos_5d_mark_iii
Also another guy find the camera is getting to much light through the view finder, so my conclusion is...
Canon 5D Mark III - Light Leak via Viewfinder
Small |
Large
the sensor is getting to much light "leaks" and when you take the picture the picture just use the light coming through the lens and that is why the pictures are underexposed.
so start to pack your camera for a replacement, I already sent mine for a refund 3 days ago, and now I am waiting to see how this ends to buy a new version.
Navigation
[0] Message Index
[#] Next page
[*] Previous page
Go to full version