When used with the Optec reducer and the JMI autofocuser, external
filters can be added with minimum of focus changes.

downs
Willard Observatory
http://members.aol.com/rlecker/optas.html

writes:
>Has anyone tried to operate a 216xt as a color camera using individual
>filters? In consideration of the inconvenience of changing filters
>between exposures and the extra time to gather the frames for
>combining,
>can it be done?
>
>If so.....
>
>1. How hard to do the focusing for each color? Is there enough light
>transmission?
>2. How much extra time to shoot enough exposures? (I figure at least 3
>to 5 at each color).
>3. How were the results? How did it turn out compared to using a
>filter
>wheel if you were ever able to compare?
>4. Is this a viable approach to color CCD considering the additional
>($695) filter wheel cost, at least on a temporary basis?
>
>Thanks!
>m.
>
>
>
>

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