Thread: Grus - Quartet
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Old 06-10-2014, 04:52 PM
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Shiraz (Ray)
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Join Date: Apr 2010
Location: ardrossan south australia
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hi Peter. looking pretty impressive overall, with only a bit of noise appearing to be the main remaining problem.

As I understand it, apart from spectral filtering, the two approaches that work in pollution are:
1. optimise the sub length for the conditions (if it varies, err on the longer side)
2. use some very high quality flats (also need high quality darks (and possibly bias) to calibrate them). What sort of flat procedure do you use?

Once you have done that, there is nothing but extra total exposure time - each extra mag in sky brightness requires very roughly double the total exposure time - but more total time will certainly do the job if your flats are good enough. Longer subs will not help though.

Cheers, Ray

Last edited by Shiraz; 06-10-2014 at 09:38 PM.
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