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RB, I got the Atik manual filter wheel from a guy in the US second hand. He's selling it to me for US$175, which is a pretty good deal as he only used it twice before he upgraded to a motorised wheel.
I think the Atik's are about US$200 to buy new.
The challenge is going to be turning the filter wheel without bumping the scope too much, to ensure the planet doesn't whizz out of the FOV, and keep the dampening down time to a minimum so I can start capturing the next colour.
I'd like a motorised wheel, but they cost more than the camera.
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