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It really is coming along nicely Grahame. Alas I have no idea how your going to handle the Halo's although I will be interested to see what solutions you come up with.
Just one thing for Clive :
The Qhy9 does have a sealed chamber, but no, one set of flats won't work, any dust on the filters, or scope surfaces needs to be accounted for as well.
Also, camera rotation within the focuser alters the view through the optics field.
I've been playing around with my light box and have fitted a pot??? (variable resistor) and a series of resistors in series in the positive power lead to get the light source scalable enough to dim it sufficiently to allow the shutter in the luminance channel to get out of the way.
I'll let you know the details when I get it humming along, basically it's been four wet and stormy nights with me in the garage with everything set up and taking exposures, changing some stuff and then doing more exposures till it seems to work.
Good luck
Darren
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