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To do photometry for measuring an exoplanet, we need to be able to measure magnitude changes at the 0.01mag level.

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Starshoot II which is somewhat better resolution than the dsi-pro, and it's cooled, so, should be useable for a much longer part of the year.

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- Since the transit stuff is a lot of frames over a long period, I'm thinking that I could use the filter wheel, shoot successive frames behind different filters, and end up with light curve plots for different parts of the spectrum, all from one evening of shooting. The idea is, once I've established the exposure time required behind each filter, change filters between every shot. Is this a valid concept ?

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I have no experience with this, but from what I've read, this isn't feasible. The problem is that filter wheels are only accurate to within a few thousands of an inch, which is inaccurate enough to cause milli-mag discrepancies in your flat-fields, due to dust on the filter or whatever. For transit work, you can't vary the optical train without taking new flats. I read that in The Sky is Your Laboratory, which I highly recommend.

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Rich
Rich's Astro Blog-- http://cflastro.blogspot.com

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