11th September 2010
M57
10" Newtonian, 4*6 minutes Last week I tried 20 minute
exposures of M57. Results were disappointing. Faint detail in the nebula was
rather blurred. This image uses the 4 best from a batch of about 12. I
suspect that any more detail in the nebula will be elusive to show. The object
is very small on the CCD chip, and this is a much enlarged sub frame.
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This shows the full width of a frame
to illustrate the difficulty. |
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