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Steve
Good analysis and evaluation
The only refractive optical element ( glass ) in my set up is the televue 4 x Powermate with Televue t ring adapter
My Canon 600D body with adapter screws into the powermate and then into the 2” focuser of my 6” f6 newt
I’ve never heard of a Televue powermate with optical issues or the cause of optical issues
I’ll suppose one could put it down to atmospheric distortion or similar at lower altitudes and leave it at that ?
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