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13 August 2007

Ask MeCha: If you know anything about how digital cameras work, I have a question for you about the light sensor.[More:] I recently bought a second-hand digital camera, and am still learning how to work it. (It's a DSLR, and I've only ever used point-and-shoots.) For some reason, if I take pics outside in bright sun, even if the setting is on "AUTO," the picture completely overexposes. It works fine indoors and in lower light.

The camera records video (.AVI format) too, and if I record an AVI outside, it looks just fine. This makes me think that the sensor is okay, and there's just a setting I'm missing somewhere. Am I right about this? Or, (and I guess this is the real question), do cameras have two different sensors for photos and for video?

I tend to think it's the same sensor for both, but I may be wrong, and haven't had any luck searching for the answer online.
What model is it?
posted by mischief 13 August | 11:15
It's a Sony, at least three years old, but I don't have the camera here at work to get the model number. I guess I should have included that.
posted by BoringPostcards 13 August | 11:21
I'm familiar with Minoltas. They always overexpose in AUTO mode. They include a MYMODE setting for locking in light settings to be +/- the camera's built-in AUTO settings. One of the first things I do when I get an upgrade is configure the MYMODE settings to prevent overexposure.

You might check your user's guide to see if Sony has something similar.
posted by netbros 13 August | 11:41
I'll do that, netbros.
posted by BoringPostcards 13 August | 11:51
What setting are you shooting in? I remember accidentally shooting a bunch with my camera in shutter-priority mode (Tv on a Canon) when I thought I was in auto, and the shutter speed was too long = overexposure.
posted by rhapsodie 13 August | 12:42
Probably the metering in the Auto setting is hosed. The AUTO function is guessing what shutter speed and aperture to use. The sensor is purely a neutral item - just like with film, the factor your camera controls is how much light reaches the sensor - which is done by a combination of how wide open the aperture is and how long the shutter is open. Try Aperture priority instead of Auto, and then try Shutter Priority, and then try manual (use the histogram to determine correct exposure - given an average scene it should be a bell curve weighted towards the center of the graph). If it is still messed up in aperture or shutter priority, probably your meter is miscalibrated.
posted by matildaben 13 August | 12:49
Forums are your friend. I would find the model number and then search for forums with threads devoted to that camera. It's almost guaranteed you will run into someone who has or had the same problem you do, and there will usually be very good advice to fix it.

I've often had better luck fixing things with information I find on-line in a forum than I have had dealing with manufacturer tech support, but of course your mileage may vary.
posted by King of Prontopia 13 August | 14:52
This is all good advice- I'll explore this this evening. Thanks y'all!
posted by BoringPostcards 13 August | 14:55
Quick question for England bunnies. || Old-fashioned video cameras and runaway trains.

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