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Photo

The Southern Beehive Cluster in 15 Seconds

DSLR DSO Astrophotography
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#1 BQ Octantis

BQ Octantis

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Posted 11 April 2021 - 08:33 AM

G'day all,

 

Been processing old data. Pushing a single sub to its limits is high on the priority list. This one was from my uncorrectable C5/750 SCT (from ca. 1975, so not enough backfocus for a field flattener/coma corrector):

 

(Click for full size @ 35%.)

gallery_273658_7587_100438.jpg

Capture & processing details

 

Cheers,

 

BQ


  • zjc26138, lukasik, chrysalis and 3 others like this

#2 deansjc

deansjc

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Posted 11 April 2021 - 10:55 AM

Ok, so the blems are apparent, but this is a very good image pulled from very little exposure.  Nicely done.  Nice star colours.  You've encouraged at least one person to try to get more with less!

 

John



#3 BQ Octantis

BQ Octantis

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Posted 12 April 2021 - 02:28 AM

Thanks John! This stemmed from seeing a northern Beehive Cluster shot with two hours of data—and yet the stars were quite jagged around the edges from oversharpening. I realized that a star field requires a very different workflow from other DSOs—the stars need far less sharpening than other targets, and they're plenty bright (I only need like ~20sec on Trapezium and the surrounding clouds when I do an HDR to bring back the burnt-out parts. So I figured I'd give a single sub a go. I got good results at 100% scale with 30sec at f/2.8, so in this case I tried my hand at my f/6 data. I could only squeeze 50% scale out of that, but still pretty good I think…




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