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Thanks for the reply Blue Skies, is there any particular way to figure a plate glass mirror? like what is the difference in figure from a warm mirror just figured to a cooled down one..if the mirror showed overcorrection when warm would it settle closer to correct or would it tend to be more overcorrected when cool?
The scope probally won`t go through huge changes in ambient temperature as it will be outside in a shed that will be well ventilated so should stay close to outside temps. Here I would expect a 20 degree swing from daytime top temp to nighttime low at worst..
Ok anyone know where I can get a couple of plate glass discs cut in sydney out of 20mm-25mm sheet?
cheers
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