I have no idea how many MP my camera is. Yup, the zoom figures you got there is right. To get the mag I use my 32mm eyepiece with a 2X barlow. I then use the camera zoom (I had it at 15X for this shot). Therefore mag = (1250/32) X 2 X 15. That gets 1171.875.
Also, I had another attempt at imaging Saturn at this mag tonight. Its not very good though, there we clouds everywhere (imaging through little gaps) and my focus was a bit off.
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