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Well I have a cooled 40D, homebrew job but..-25 below ambient no prob.
Total cost of camera/filter with regulator etc was under $1000
Seems to work well, but if I had the extra money I would get a OSC ccd. Hopefully in the next year or two..something like the new QHY-9 color or a even bigger chip.
Like Doug mentions, the ability to do widefield shots with standard lenses is a advantage as well as the liveview. Don`t know how you go about stopping down a standard lens with a ccd but?
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