Hello! Just stumbled across your site - you guys really seem to know your stuff! I've got a problem for you - my 20D have been fantastic - shot a wedding on Saturday, and near the tail end of things anything I shot in side was dark. Didn't matter if I used manual setting or auto - flash didn't register with the camera, and the built in didn't seem to register either. Outside was fine in auto. When you look through the eye hole, everything is just so dark - even if it is not dark in the setting. It also has trouble in auto focus (because everything is so dark?) Is this fixable? Thanks!!!
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Re: Everything is so dark!
If the camera is working properly with other lenses, then you have a problem with that lens. In M, you can set the aperture yourself, and the photos come out properly exposed. When the lens is set to auto, apparently it is going to minimum aperture and not responding to the camera's 'instructions'. The thing that makes me think so is that you say everything looks dark through the optical viewfinder. Normally the aperture stays full open so you can see and compose your shot, and only stops down to the correct aperture when you actually take the shot. I would suggest having the lens checked by an appropriate camera service shop.
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Error 99 is a result of an electronic communication problem normally between the lens and the camera body.
Use a red pencil eraser to "polish" the contacts even if they look clean do it again. Take care to keep dirt out of the camera and lens bodies.
Another thing is often times the camera firmware needs to be updated to move on from this.
Another thing is the CF cards? The 20D was in an era where pretty well the larges CF card was a 2gig,I use several 1gig however if you have updated your cards to say an 8gig the firmware just can't handle the card.
Okay moving on clean the lens and body, update firmware, make sure the CF card isn't beyond the camera capabilities and last if all that stuff didn't work the it's possible the actual sensor is really dirty and needs cleaning.
The worst case scenario is that the shutter has failed. The Canon 20D is only good for 60,000 actuation's.
Solved the problem by going to the Canon product support site. It seems that there is no problem at all. The way the camera is designed is the problem. To be able to use the rear display lcd as a view finder, the camera needs to be able to lift the mirror to allow the sensors to pick up the image and display it on the screen. The 20D does not have this abilitiy. Apparently some later models do allow you to raise the mirror. It was this feature on those models that led me to believe that the 20D should do this too.
It sounds like the aperture is getting set very high. If the aperture is a high number, the lens opening is very small which lets less light in and would cause a dark image. This would also show any dust that is in or on the lens or image sensor. The dust doesn't usually show on apertures with a larger opening (smaller number). Make sure your aperture is being set to a reasonable number, probably no higher than 8 or so.
That would explain the darkness if the lens is stopped down. It would seem the aperture control is faulty on the camera body. Normally, the aperture remains open until you take the picture. It is only closed down while the shutter is open.