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Banding issue when taking flats with light box
Hi all,
Hoping someone can help me with an issue I've been having while using a recently purchased light box.
When attempting to take flat frames using the newly purchased light box, I get a horizontal banding issue on all my frames. This only occurs when using the light box, not when using the old t-shirt and sky method. Nor does this banding show up in frames of any other description (light, dark, bias etc.)
The light box used LEDs and is powered using a 5.5x2.1mm 12V DC connector with a variable resistance dimmer in-line. I have tried powering it directly from my ASIair and also independently from a 12V DC Li-Ion battery pack.
I have varied the intensity using the included dimmer all the way from full bright to full dim with exposure times varying from 110ms to 5sec, the banding persists throughout.
I have tried rotated the light box 90 degrees and the banding remains horizontal.
I have also tried taking the dimmer out and using the inbuilt PWM function of the ASIair to no avail.
I have attached some photos to help demonstrate what I am talking about. The banding is not a consistent pattern and it changes with every frame. Please forgive the poor image quality, its hard to get them below 200kb!
The relevant equipment I am using is as follows:
Esprit 120ED
ZWO ASI2600MM Pro
ZWO ASIair Pro
12V/10A AC to DC power adapter
Powertech 12V DC Li-Ion portable power centre
If anybody has any ideas of whats going on here, it would be greatly appreciated!
Cheers,
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