Handbook for the SXVR-H16
Issue 1 June 2009
15
likely to saturate the highlights of the picture. The signal-to-noise ratio will improve
at a rate proportional to the square root of the number of summations (summing 4
images will double the signal-to-noise), but
different
exposures must be used.
Summing an image with itself will not change the S/N ratio!
A deep image of the Deer-Lick galaxy group by Rick Krejci
Although I have concentrated on the use of a telescope for deep-sky imaging, do not
forget that you have the option of using an ordinary camera lens for impressive wide-
field shots! A good quality 200mm F3.5 lens with an infrared blocking filter will yield
very nice images of large objects, such as M31, M42, M45 etc. If you cannot obtain a
large IR blocker for the front of the lens, it is often quite acceptable to place a small
one behind the lens, inside the adaptor tube.
Taking pictures of the Moon and planets:
The SXVR-H16 is not intended for planetary imaging, as a much smaller CCD is in
many ways much better for this. However, lunar imaging is a different matter and the
