With the introduction of commercially available cooled CCD cameras in
the 1990's, astrophotography has gradually shifted from film emulsion to
digital imaging. The performance of these CCD cameras now greatly exceeds
that of film cameras; unfortunately their price has kept them out of
reach for many amateur astronomers.

With the new breed of Digital SLR cameras, this is changing. While DSLRs
are perhaps a tenth as sensitive as high-end cooled CCD cameras, they
are also a tenth the price. Modern DSLRs are more sensitive than the
best film emulsions, and unlike film do not suffer from reciprocity
failure.

DSLRs are not able to take single long exposures like CCDs, but software
can be used to extend the exposure time and to stack multiple images.
The trick to getting great images with DSLRs is to use the right
software . MaxDSLR.

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