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Did a bit of googling and found I can use Winjupos to measure pixel size, and it also gives planet size in arc sec, much easier! For my current set up with the 3x barlow, FL worked out to be 4945. Focal Ratio worked out to be 19.7, (not 14.4 like I thought) meaning my 3x barlow is actually working like a 4.1x barlow. Probably why it has been giving the best results. Now I need to work out what the two 2x barlows stacked were actually giving.
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