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The random red pixels are hot pixels, most stacking software can remove them with dark and bias frames,
In a pinch you can use a stereo 2.5mm audio cable for a remote trigger, shorting the tip to the sleeve will take a capture, equally shorting out the sleeve to the ring will make it focus, and for most canons turn off the screen, with dramatically increases battery life.
Right now I'm using a lab power supply as an intervalometer... and worked this stuff out, its an odd sensation when the intervalometer is the most expensive part of your setup.
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