Most Digital SLRs use the same CCD chips as the much more expensive astro-imaging cameras, but don't achieve the same response to hydrogen-alpha light.
This is because the DSLR manufacturers fit an Infra-Red blocking filter across the front of the CCD: this improves the performance in for "normal" (daylight) photography but is no good if you're trying to image nebulae.
The dedicated astro-imagers will therefore have their filter removed or replaced, see:
to achieve a true astro-capable camera, for a much lower cost than the custom cameras from StarlightXpress et al.
For those interested in imaging and image processing with DSLR, CCD, webcam or film.
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