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nigelbeaumont

How early in evening to start NB imaging

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I normally wait until the start of astronomical dark to start imaging, which is about 2200 at the moment where I live. However could I start earlier in the evening if I'm narrowband imaging, say about 2100? It would gain me an extra hour at a sensible weekday time for the longer NB subs

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My sunset is probably similar to yours. The following Ha subs were taken last Sunday, the first at 9.10pm and the second at about 11pm.

9.10pm

post-11453-0-59510700-1441785385_thumb.j

11pm

post-11453-0-76789100-1441785440_thumb.j

The basic image analysis in SGP does give a higher star count for the second image and close inspection does reveal it to be superior but the first sub is not time wasted in my opinion.

Edited by wuthton
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Very nice comparison. I suppose it depends on what you hope to achieve.

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