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Old 23-03-2017, 09:35 PM
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Shiraz (Ray)
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Join Date: Apr 2010
Location: ardrossan south australia
Posts: 4,918
NGC3132 - yet another version

Couldn't get near Mike's beaut image, but was still pleased at the result. In particular, efforts to clean the optical system and suppress stray light seem to have paid off.

A lot of processing was required to control the dynamic range - and the stars and noise show the damage. Have also tried to ensure that the masking did not introduce "features" - but there may be some spurious structure and I intend to do a careful reprocess to check/correct. Also have some RGB and will tidy up the stars when the winter sets in and astronomy stops.

Used 6/7nm NB filters, with 6 hours Ha ( mix of 2 and 5 minute subs) and 3 hours of O3 (2m subs). 250/f4 and ASI1600, gain 100. Had more data, but all of the imaging was carried out with the moon up - the stuff I used was the highest-resolution/lowest-sky cull from a larger dataset. Seeing was about average at ~2.2 arcsec or thereabouts.

thanks for looking - advice on colour/processing welcomed. Regards Ray
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Last edited by Shiraz; 24-03-2017 at 12:12 AM.
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