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Others just reduce the current to the peltier cooling and this also prevents any dewing within the spacer/reducer.
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On the subject of reducers and field flatteners i take it attatching a mpcc is a simple affair..... probably should refer to the website but will pose it here anyway.
by way of 40d as a beginner entry camera, i think its way more than that, its a great camera good for all but the limited Ha targets, just i think the q8 has the edge for purely astro work ,cooling and pretty much modded response as standard., we are spoilt for choices these days 20 years ago this was only dreamt of.