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What is going on here?


stevie e2
11 1.2k 2 United Kingdom
11 Aug 2012 7:18PM
Help please! My Canon 1Ds k 3 is producing images with a pale band down one side:-s5e4123.jpg



Only happens at high shutter speeds of over 1/800 sec., I've only just noticed this as I don't often use this camera body for action shots. Not visible at lower speeds. I presume a shutter problem? I'm sure it needs to go off to Canon but I'm off to Africa in a few days!

Any experience of this?

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Coleslaw e2
9 13.4k 28 Wales
11 Aug 2012 7:33PM
Where, Stevie? I can't see it.
oldblokeh e2
3 925 United Kingdom
11 Aug 2012 7:39PM
Looks like the right-hand edge on the posted image. A shutter problem would seem to me to be the mostly likely cause. Looks like there's a slight bit of under exposure just to the left of it, too, unless my eyes are playing tricks.
Ian White e2
12 177 United Kingdom
11 Aug 2012 8:02PM
Had the same sort of problem with my nikon d 90 is the camera auto bracketing, just an idea

Ian
Coleslaw e2
9 13.4k 28 Wales
11 Aug 2012 8:16PM
Ah....I can see it now. Can't help though....Sad
11 Aug 2012 8:22PM
Could it be that the shutter is bouncing at the end of its movement, rebounding slightly and re-exposing a strip of the sensor?
stevie e2
11 1.2k 2 United Kingdom
11 Aug 2012 10:10PM
Thanks guys. Fortunately I have another body for action shots on my Africa trip, the 1Ds should be just about OK for lanscape stuff and back-up as there is no time for repair now!
12 Aug 2012 8:37AM
My friend had the same problem and it got worse. Sensor problem so now he could only use it on long exposures or he would get the strip.
stevie e2
11 1.2k 2 United Kingdom
12 Aug 2012 8:45AM

Quote:My friend had the same problem and it got worse. Sensor problem so now he could only use it on long exposures or he would get the strip.


Oh dear me, that sounds expensive.....
12 Aug 2012 8:58AM
It is very likely a shutter problem - the camera probably needs a service.
Shutter operation detail first.
The shutter works by moving across the short dimension of the frame, with the "shutter open" blade moving first and the "shutter closed" curtain moving second.
At shutter speeds slower than about 1/400 the sensor is completely uncovered for part of the exposure time.
At faster than about 1/400 exposure is via a slit between the 2 moving shutter blades, with the slit getting narrower as shutter speeds increase - to around only about 6% of the sensor height at 1/8000.
The likely problem.
This shutter seems to be "bouncing" either at start up or exposure end, and probably more bottom left in this picture than top left so that a narrow slit of the picture area is receiving extra exposure.
At slower speeds the extra exposure effect is not significant compared to total exposure.
By 1/800 with a travel time of about 1/400 and a slit width of about 50% the extra exposure is enough to be obvious.
I hope this helps.
stevie e2
11 1.2k 2 United Kingdom
12 Aug 2012 3:58PM
Thanks Len
stevie e2
11 1.2k 2 United Kingdom
22 Sep 2012 9:19PM
Just a quick comment on a happy ending to this. The camera went off to H. Lehmann of Stoke (Canon CPS approved repairer) and in about 5 days came back with a new shutter fitted, free of charge! Also, the camera, which had been bouncing around recently in a Landrover in Africa (and was therefore absolutely filthy and covered in dust) received a thorough clean and looks like new! I also got a very polite phone call during the repair to explain the problem and reassure me they'd fix it as quickly as possible. All in all an excellent service!

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