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Old 04-08-2011, 06:45 PM
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Issues with horizontal banding, 5DMKII???

Hi Guys.

I'm having issues with my camera in that I keep getting banding on all my pictures. I'm fairly sure it's power related although I run the camera off batteries when imaging. The only cable attached is the usb cable.

I get the same result even if I dont download to the pc but to the CF card. I've tried a different usb cable but same result.

Any ideas on what could be causing it?

Attached is a zoomed in veiw of the image. Ignore the guiding issues as this was just me testing.

Thanks
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Old 05-08-2011, 03:38 PM
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Old 05-08-2011, 03:39 PM
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multiweb (Marc)
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Have you tried adding a ferrite block on your USB line. You can get them from JayCar. Also clear your USB lines off any power cables.
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Old 05-08-2011, 08:31 PM
gbeal
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You get it all the time, even with camera batteries, and NO USB cable plugged in?
Try different ISO's, and longer/shorter shutter durations.
See what you get and report back.
Gary
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Old 08-08-2011, 01:45 AM
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midnight (Darrin)
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I don't believe the USB comms would affect the quality as the serial communications have hardware level error checking and software level CRC checking to ensure the data sent is received without corruption.

I have noticed banding too on my 40D but only at higher ISO (eg 1600) and all I can think of is that when you select a higher ISO, you are increasing the gain on the internal amplifiers. If there are any stray fields (eg 50Hz from power leads is a likely source) they may be amplified too.

Power frequency signals can be detected from many meters away and I can only think of this as being a possibility.

Sorry I can help much more.

Darrin...
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Old 08-08-2011, 01:56 AM
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mswhin63 (Malcolm)
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Could be power supply issues
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Old 08-08-2011, 08:08 PM
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White Rabbit
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Thanks guys.

I'll get ferrite block and see if that helps. I'll try another power supply as well and see if that helps.

Thanks
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Old 10-08-2011, 07:46 PM
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tonybarry (Tony)
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The works 5D is sensitive to magnetic fields. We have a machine which generates quite large fields and the 5D flickers in live view (and on record) when it is in proximity to the field.

Note this field is not large as far as MRI would be concerned. It does not get over a couple of milliTeslas.

Consider moving transformers etc away from the camera.

Regards,
Tony Barry

Last edited by tonybarry; 10-08-2011 at 07:47 PM. Reason: clarified field strength
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