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Hi Peter
I have and use the same equipment as you, NG 127mm, ZWO290MC and a 2.5X Powermate, using SharpCap for avi capture. In the software I set an ROI of 400 X 300 and for Jupiter , a Gain of 250 and with the planet near opposition and bright, can get a frame rate of 200/sec. in Raw8. With Saturn atm I increase the Gain to about 300/350 and get a frame rate of approx 100/sec.
The smaller the ROI you can set the less black sky and therefore less unneeded data to download for each frame, helping to increase the frame rate and freeze the seeing.
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