Specifications

36 AUTOSTAR CCD PHOTOMETRY
Note: There are four hex-head screws at the corners of the camera.
The hex-head screws hold the camera together. Do not remove
those screws for this modification.
Figure A-2. DSI Pro Camera with Filter Slide (left)
and Low-Profile and Original Nosepiece Adapters (Right).
Filter Wheel
With the low-profile nosepiece adapter installed on the DSI Pro,
the next step is to add a filter wheel. There are several available on
the market, ranging from under $100 to over $1,000. An excellent
and inexpensive choice is the ATIK Manual Filter Wheel. This can
also be purchased from ScopeStuff or from Adirondack Astro
Video (the U.S. importer) for about $200. The ATIK filter wheel is
well-made and can hold up to five standard 1.25 inch (31.7 mm)
screw-in filters. Figure A-3 shows the ATIK Filter Wheel
disassembled and the filter carrier disk with photometric filters
installed. The ATIK wheel uses standard TEE threaded adapters
(provided) to attach it to the low-profile nose piece on the camera.
It also comes with a removable standard 1-1/4 inch (31.7 mm) to
TEE thread nose piece.
Since the U band filter is not used with the DSI CCD camera, an
optional filter such as Hydrogen Alpha could be placed in the fifth
position, or the “Clear” (IR Block) filter that comes with the DSI
camera can be installed, for occasional regular deep-sky imaging
or “white light” photometry.