Meade Image Processing Specifications download pdf (Page 47)

AUTOSTAR CCD PHOTOMETRY 37

Figure A-3. Disassembled ATIK Filter Wheel.

CCD Photometric Filters

For most photometry, special filters must be used. The red, green,

and blue (RGB) astro imaging filters supplied for the DSI Pro and

DSI Pro-II cannot be used as photometric filters. These are color

interference layer coated (dichroic) filters. For CCD photometry,

sets of five dyed glass photometric filters – Ultraviolet (U), Blue

(B), Visual (V), Red (R), and Infrared (I) are available, conforming

to the Johnson-Cousins standard passbands.. While there are other

filters, these are the most commonly used in astronomy.

But unless you are planning on using a meter-sized telescope, the

U filter will not be of much value, as the DSI Pro (and DSI Pro-II)

Sony HAD Ex-View™ CCD chips are not sensitive in that band.

Plan on using just the BVRI filters. There are several places you

can buy the special dyed glass photometric filters. Astrodon offers

the least expensive yet good quality filters, at about $310 for a set

of Schuler BVRI Photometric filters.

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Meade Image Processing Specifications Page 47