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 Post subject: Not seeing red?
PostPosted: Mon Oct 26, 2009 7:46 am 
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Joined: Mon Oct 12, 2009 6:47 pm
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Location: Bolton
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:
http://www.dslrastromod.co.uk/index.html
to achieve a true astro-capable camera, for a much lower cost than the custom cameras from StarlightXpress et al.


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