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Filters

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Many of the most spectacular amateur ccd images are tri-colour images of deep sky objects. One-shot colour ccd's are increasingly available but these inevitably sacrifice some sensitivity for the convenience of using internal filters on the surface of the chip. In order to do tri-colour imaging with a standard ccd camera a way of introducing filters in to the light cone is needed. Filter wheels are popular with sct users whose telescope produce relatively narrow cones. A f3.8 Newtonian poses somewhat more of a challenge. The system I have chosen is that of a filter slide to introduce filters between secondary and focuser. A well described example is here. Some of the parts come from a dot matrix printer. A stepper motor driving a threaded rod makes filter selection. The motor itself is controlled by the same pc that looks after the dome and focuser.

 

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Copyright 2006 Steve Chambers. All Rights  Steve@pmdo.com

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