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Old 15-08-2018, 05:31 PM
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rcheshire (Rowland)
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Another Antares Rho Ophiuchus

Auto-guiding is a nice recent addition and I had hoped to get more data this month. But we need the rain.

A little more work and this is as good as it's going to get. Originally posted in the beginners section.

2.1 hours, 240 second subs at ISO 200, under a bluish LED sky.

Read noise was a problem, mostly filtered out in StarTools Heal module using the Mono dead pixel mask option.

I find the inverted L* channel makes a good saturation mask for this region.

And I am quite happy with the preprocessing using my own scripts.
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Old 15-08-2018, 06:10 PM
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You've brought out a huge amount of nebulosity, Rowland!
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Old 16-08-2018, 05:48 AM
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Thanks Rick. Given complaints about LED street lighting, I'm surprised by the result. Lower ISO and longer exposures (another discussion) seem to improve the result in this case. I wasn't aiming for a pretty constrasty picture, more the success or otherwise failure of the technique to reveal detail vs read noise.
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Old 16-08-2018, 09:14 AM
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Lots of colors and depth in that shot. Cool.
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Old 16-08-2018, 12:31 PM
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A very vibrant image.

Greg.
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Old 16-08-2018, 01:30 PM
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Greg and Marc. Thank you for your comments...
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