CHAPTER 7. APPENDIX
exposures. This is not a problem for bright objects,
but it limits the observation of faint targets.
– Spectral bandwith is smaller for a DSLR camera.
A CCD camera can go up to near UV and near IR,
where DSLR camera is strictly limited to the vis-
ible domain. Note that it is better to remove the
IR-cut filter from the DSLR camera, to cover Hα
(this is a usual operation in astronomy).
– The DSLR camera has a color sensor. This makes
raw images more complex to work with (there is
the Bayer matrix to manage). Note that the over-
sampling in the DSLR camera configuration means
that the Bayer matrix has no effect in practice on
the Alpy 600 spectra resolution.
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