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Set up on a beautiful clear still night. Spent a couple of hours getting frustrated by mushy images, defocused stars looked like they were boiling. Checked and rechecked collimation but naked eye view were telling me that seeing should be good!
Finally realised I had plugged the heater cable for my secondary which normally runs at 10% into a 100% oulet and the mirror holder was almost too hot to touch. All the convectiom was simply ruining the seeing!
Took another hour to cool down so I could start doing some observing.
Malcolm
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