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Thin lines distorting my images in my Digital camera? Answered

When I use an external power source in my Canon Digital Camera the Image taken by flash is full of  thin Gery horizontal lines.
These lines do not come when photo is taken in daylight. Only the Flash Photo is effected. WHY?


My guess is that the external supply is interfering with the camera, by injecting noise into it over the supply cable. Try a different (but correctly rated) supply, or even a battery pack.


Yes, as Nacho suggests, pics will help identify the problem. Are the lines horizontal or vertical? Vertical Lines would suggest a lighting problem, horizontal lines would suggest a hardware problem, possibly something like steve is suggesting.

I agree with steveastrouk, Dipankar, 99.8% sure.

. Can you post a sample pic?