My Canon 30D has suddenly begun capturing dark spots when shooting scenery or interiors that have consistently blank color areas in the upper regions. I've tried cleaning the mirror, and it happens with each of my 3 lenses, so it can't be a lens issue. Any ideas?
However, if you'd like to try to do it more cheaply, you can try cleaning it with canned air: Set the camera to sensor cleaning mode and hold it with the sensor facing
down. Then blow on the sensor at each corner, wait a moment, then blow middle. This will get some dust out of the way, but it mostly just pushes it to the sides of the sensor, where it's less likely to be in the way. Eventually, you'll have to get the kit listed above.
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Re: 30D spot problems
Have you tried cleaning the sensor? Cause this could be causing the spots. There are good guides on how to do it here and here. If cleaning doesn't help, you can try updating the firmware of the camera and in the worst case scenario, the sensor has malfunctioned (which I hope is not the case). Good luck!
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To make sure this spot is where I think it is, on the sensor, You should put the camera in manual, A priority and whose the highest value. Shoot in bright light a complete white paper.
Then evaluate the picture on the monitor. If the spot is clearly viable the spot is on the sensor. With a fixed lens on your powershot, you can't repair or correct yourself. You should contact Canon. Don't tell Canon, you were in a moist environment. Perhaps a mould is growing on the sensor.
I would not try this as the sensor cleaning system is pretty effective, but if your still getting dust spots I would A. get it sent back to canon for a dust clean (should be free in the first 2 years) or B
use the bundled software DPP to take out the spots. theres a setting in the camera which asks you to take a shot of a blank paper then send this photo to the DPP software. it then maps out the spots on that image and it batch process all you images thats has dust spots in them and removes them. it works really well and canon has had this in their cameras since the 30d.
I dont have the camera with me but if you put the camera into a manual mode them press the menu key and make your way to the yellow area of setting it would be there but first install DPP which would be on the CD that came with your camera.
Failing that if your in the camera settings i believe in the yellow area again there is a setting called "cleaning mode" which will lift the mirror without a lens on so you can use a rocket blower. this setting may have been taken out on the 60d as its not recommended
You have dust on the sensor. Google the words "cleaning a DSLR sensor" and you will find sites explaining the procedure with pictures and where you can get the supplies necessary. It may sound complicated and scary but in reality it's very easy.
It's 99% dust, especially if it appears mostly in smaller apertures (<f/8). To test it, select a small aperture (e.g. f/16) and take a photo of a blue sky. The spots will show consistently on the same location.
They're hard to clean, so chances are you just missed them. Try again, or, better still, send it for cleaning to a professional.
learning to use light metering correctly can have its challenge. the manual will guide you on how to set up to read light from the subject. spot metering a dark area will cause general overexposure, or a washed out look. spot metering a bright area will cause a dark image. if you are on spot meter and shoot two people standing together against a bright lit background, your meter will see between them if they are centered, and read all that bright background, setting the camera to a less sensitive combination of aperture / shutter speed, resulting in a dark image. use field averaging meter setting and be sure you are metering the subject and not the background. try shooting a wall that is fairly clear of other colors and uniform it light hitting it, you should have a correctly exposed image. since it works in other modes (at least 1, anyway) then it is unlikely you have an exposure compensation issue. that is the only other non defect issue that would cause your problem. once you confirm that you have these settings correct and still get a dark image, its time to have it serviced. good luck mark