jim_gross Posted September 9, 2007 Share Posted September 9, 2007 Has anyone had an issue with the 30D underexposing by 2 stops (-2)? I looked back at several weeks of shots and found that this problem has turned on and off at least three times in the last two weeks. Now it will not stop underexposing. Observations: 1. This is only happening in P, Tv, Av modes and the exposure display is showing -2 not 0. 2. In Photoshop, the bad images look underexposed and shows a -2. ex: 1/15s at F/4.0 -2, ISO 100. 3. The green mode looks properly exposed and Photoshop does not show the -2. 4. In the M mode, the exposure display is working and if set to 0, the photo is properly exposed and Photoshop does not show the -2. Tried a cold reboot by waiting 10min with no battery in camera and then replacing battery. This did not fix the problem. Going to try cold reboot after 1 hour but do not have any faith this will fix it either. Looks like a trip to Canon to me. Is there something I may have missed? Jim Link to comment Share on other sites More sharing options...
andy_jones2 Posted September 9, 2007 Share Posted September 9, 2007 In any of those three modes, do a 1/2 press of the shutter button and QUICKLY rotate the big wheel on the back of the camera two or three clicks clockwise to set the EC back to 0 (This will only work if the on switch is in the position lined up with the white mark). That is how you set (or reset) exposure compensation. If that's what you're already doing, it needs to be fixed :( Link to comment Share on other sites More sharing options...
denisgermain Posted September 9, 2007 Share Posted September 9, 2007 there is no such thing as compensation in M mode.... I have a feeling you may have turned on the bracketing? Link to comment Share on other sites More sharing options...
dotun famakinwa Posted September 9, 2007 Share Posted September 9, 2007 Jim, No - You haven't missed anything! I have reported this problem before and so have others. It seems to be a re-occuring issues with some 30Ds. I've learned to read the histogram which enables me to re-take the shot whenever it reveals an underexposure. I also shoot almost exclusively in RAW which gives me extra latitude in correcting underexposed pictures. If you send the camera back to Canon I would be interested to know if they find anything. Good luck! Link to comment Share on other sites More sharing options...
colinsouthern Posted September 9, 2007 Share Posted September 9, 2007 Denis Germain wrote: "there is no such thing as compensation in M mode" Yes and no - whereas you don't set an EC explicitly, "spinning the dial" none-the-less will still vary the exposure (with the resultant change in metering). But - the OP has said that it exposes correctly in manual, with the meter centered - it's other modes that are out - which does sound to me like EC has been inadvertantly entered. Link to comment Share on other sites More sharing options...
jim_gross Posted September 9, 2007 Author Share Posted September 9, 2007 Andy Thank you for giving me a good kick in the ---. I knew that the big wheel on the back sets the exposure, but in my panic I missed the point that I needed to 1/2 press the shutter button. I had been using manual the other day and I must have inadvertently placed it on Av mode and moved the wheel. Thanks again Jim Link to comment Share on other sites More sharing options...
leopoldstotch Posted September 9, 2007 Share Posted September 9, 2007 <p><i>"the exposure display is showing -2 not 0."</i><p> <p><i>Unless</i> that was a typo, there's your problem! You have it set to underexpose by 2 stops. Just move the EC back to 0 and you'll be fine.</p> Link to comment Share on other sites More sharing options...
andy_jones2 Posted September 9, 2007 Share Posted September 9, 2007 Jim, You're welcome . I went through the same thing a long time ago, got very frustrated, figured it out and had a d'oh moment. I remember very well since then :) Link to comment Share on other sites More sharing options...
jason_hall4 Posted September 9, 2007 Share Posted September 9, 2007 Dotun, The issue you speak of very different from what Jim is having. The common underexposeing people complain of is by 1/3 of a stop or so. NOT 2 full stops. And it showed up in the exif data. At two full stops, even RAW is of no use. Don't feel bad Jim, That thumb wheel has gotton me a few times two. Make it a habit to keep an eye on the meter in the veiw finder. Jason Link to comment Share on other sites More sharing options...
chrisjb Posted September 9, 2007 Share Posted September 9, 2007 Hi, I find it better to only switch the `on sw` to the 1st position on the 20d (I presume 30d the same) as it is all to easy to shift the big wheel with your nose while shooting, YMMV Link to comment Share on other sites More sharing options...
colinsouthern Posted September 9, 2007 Share Posted September 9, 2007 I think that trick has caught most of us out at some time or another :) Link to comment Share on other sites More sharing options...
JDMvW Posted September 10, 2007 Share Posted September 10, 2007 You can set the compensation wrong inadvertently on the 20D as well. Guess how I know. There may be other reasons for exposure problems to show up, but I know in my case, it was 'user error.' However, in my experience, 'user error' is most commonly a result of bad human engineering on the part of the designers of a piece of equipment. I'm told that a Korean War aircraft had the firing button and the eject button next to each other. Link to comment Share on other sites More sharing options...
keith_lubow Posted September 10, 2007 Share Posted September 10, 2007 Your camera is exposing two stops under the meter's measurement because that's what it is being told to do. There's nothing wrong with your camera. What on earth do you think -2 means? Just set it to 0 if that's what you want. This is like saying: "Why does my car start slowing down? It happens when I press the brake pedal." Keith Link to comment Share on other sites More sharing options...
steve torelli Posted September 10, 2007 Share Posted September 10, 2007 As Kieth said, you're not seeing it in M mode because there is no EC in manual mode, you need to change the shutter speed or aperture to over or under expose. You obviously have EC set to -2 in one of the other modes. The camera is doing what it's being told to do. Also, setting every scene at the midpoint of the exposure meter will not always give you proper exposure. Good luck. Link to comment Share on other sites More sharing options...
dotun famakinwa Posted September 10, 2007 Share Posted September 10, 2007 Jason, I stand corrected. I mis-read the question/issue. Thanks Dotun Link to comment Share on other sites More sharing options...
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