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Ken,
the DSI3 pixels are 6.5 x 6.5 micron, and it's a b+w chip so that avoids another issue.
I noticed that you and Robin had some interesting chats on the yahoo site about the use of the aperture mask on the SA.
A filter slide or wheel that could move the SA in and out of the optical train would allow you to take an image of the star field, then the spectra without removing the camera from the scope. It would make it easier to flat field away the background stars... what do you think!!
Mark
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