Canon 40D Mega over-exposure

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rainhill photo

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David
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Bought a used 40D on here a couple of months ago and all seemed ok. Got a Sigma 18-125 to use as a general purpose lens. just been on hols to Majorca and all pics taken outside in the day are WAYYY over- exposed to the point of being nearly all white and beyond recovery!! Really pi??ed that my missus and her little casio p.a.s. got better results! Have double and treble checked all menu settings and all appear to be fine. Has anyone had a similar problem? Thinking it may be a duff metering circuit or something. Pics taken in lower light or with flash appear ok. :bang::bang::bang:
BTW I do know my way round camera settings - but this has got me beaten.....
 
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Does the camera have exposure compensation that might have mistakenly been switched on?
 
On AV mode, choose a small aperture.
When you press the DoF button on your camera, can you see the lens blades working?
 
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Do you get the same with another lens. Did the Sigma work well before you went on Holiday?
 
ernesto said:
Do you get the same with another lens. Did the Sigma work well before you went on Holiday?
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Only have this lens so no comparison possible. Only seems to burn out in very bright sunlit scenes.
 
Try Luis's suggestion. It sounds like the apperture blades aren't closing for some reason
 
PitaDaVespa said:
On AV mode, choose a small aperture.
When you press the DoF button on your camera, can you see the lens blades working?
Click to expand...

Now that was interesting.... On AV mode took 1 at 3.5 - ok, took 1 at f10 -burning out and 1 at f20 - totally burnt out. This would suggest that the blades on the lens are not closing down with the corresponding f stop chosen on camera....? Would also explain why lower light shots are ok. Think i need to try camera with another lens to establish if it the body or lens are at fault.
 
That would explain it, but if its a new (or new second hand) then its a fair bet its the lens at fault. Another way round would be to borrow another body and see if you get the same results
 
boyfalldown said:
That would explain it, but if its a new (or new second hand) then its a fair bet its the lens at fault. Another way round would be to borrow another body and see if you get the same results
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Yep, now seems to be a process of elimination... As only have one body and one lens, looks like a visit to local friendly camera shop.......
 
Sounds like the aperture on the lens is not closing properly to me. Had the same problem with a film camera many years ago. Easy way to check is to put the camera in full manual mode, choose a long shutter speed of several seconds, and a small aperture. Press the shutter button whilst looking at the front of the lens. The long shutter speed should give you enough time to check if the aperture blades are actually closing.
 
Problem solved.... lens is buggered.
Tried different lens and all working fine. Put this lens on another body and same problem. Appears that the aperture blades have stuck fully open. Have now ordered the new 18-125 OS from the nice man at Amazon.
 
rainhill photo said:
Now that was interesting.... On AV mode took 1 at 3.5 - ok, took 1 at f10 -burning out and 1 at f20 - totally burnt out. This would suggest that the blades on the lens are not closing down with the corresponding f stop chosen on camera....? Would also explain why lower light shots are ok. Think i need to try camera with another lens to establish if it the body or lens are at fault.
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I'm glad you found the problem (although I'm not glad that you have a problem :lol: ).

Shots with the lens wide open have are fine because when the camera measures the light it expects the lens will be fully open.
But when you intend to make a shot with smaller apertures, the camera expects the lens to close its diaphragm and it doesn't. So, the photos come overexposed. ;)
 
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