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Old 13-09-2009, 12:00 AM
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David Fitz-Henr
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David Fitz-Henr is offline
 
Join Date: Aug 2007
Location: Bowen Mountain
Posts: 837
Home made 200mm Astrograph - Second Light

I've had a second round of imaging (and enhanced the colour in M8 as per previous recommendations). I've also pushed the envelope with respect to the sub frames exposure lengths (they're all unguided using my Paramount). You can detect some slight egg-shaped stars when you blow the image up :

- M8 (Lagoon) 6 subs at 6 minutes each. I had intended taking some more tonight, but there was too much cloud of the artificial kind (bush burnoffs all around Sydney creating masses of smoke). I've processed the image with more attention to colour this time. I hope it looks OK here - it looked good on my notebook, but some of the colours look over-saturated on my main PC (I think due to a lower contrast monitor - there's yet another expense I guess, to replace my old monitor!).

- NGC 253 (edgewise spiral) 8 subs at 6 minutes each.

- NGC 6744 (barred spiral) 6 subs at 8 minutes each - stars are definitely egg shaped here. I may be expecting too much here from the mount, although I think it was at a relatively low elevation which would be more subject to variation in tracking.
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Click for full-size image (NGC253-8subs-360s.jpg)
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Click for full-size image (NGC6744-6subs-480s.jpg)
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