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Thanks for that. Interesting.
Orright the whole PEC thing is entirely a mystery to me. For programming PEC does it have to be a live feed, or will a video file work? I don;t own a webcam, so wondering if I can use a DSLR - film for half an hour and then give it the video file.
Alternately my full frames can be tethered by USB with live view through Backyard Nikon; can they be used to program PEC? Would the error be big enough at 510mm for it to notice what was happening, or would I need to use a Barlow adapter?
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