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Old 30-05-2011, 11:25 AM
TrevorW
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Rho Ophiuchus

The triple star system

Just a question re nebulae

how many exposures would be required to show the nebulae surrounding these stars

I captured over 90 minutes of data with my GSO 8" yet I can't seem to get any dust to show up in the image

is this more suited to widefield imaging or do i just need more data

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Old 30-05-2011, 02:32 PM
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Logieberra (Logan)
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I'm no expert... but all the good images I've seen of this area were taken with an SLR camera lens...
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Old 30-05-2011, 04:57 PM
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Tandum (Robin)
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It's a huge area Trevor. Doesn't your star software show you FOV? Here's an RC8 with QHY9 pointed at the area. Your qhy8 sees a little more sky than this. The big boxes show the FOV of the tak fs60 with a qhy9.

I think Jase's version is the best I've ever seen and it was a huge mosaic.
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Old 30-05-2011, 06:25 PM
TrevorW
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Sorry I should be more clear in my question refer attached JPEG

this is my FOV
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Old 30-05-2011, 06:52 PM
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Camera?

Length of subs?
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Old 30-05-2011, 07:26 PM
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Octane (Humayun)
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You're going to require 15-minute luminance exposures to bring up that dust.

H
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Old 30-05-2011, 07:33 PM
TrevorW
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Thanks H

9 X 10 minute colour subs from a OSC CCD
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Old 31-05-2011, 01:26 PM
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suma126 (Shane)
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Trever i have tried 10 min subs with my rc8 and Nikon d90 iso 400 and still couldn't bring out the dust clouds. i think i will have to bump up the iso 1000 or buy ccd camera and do longer subs.
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Old 31-05-2011, 04:22 PM
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Cheers Shane I'd try ISO800 if I was you this was my standard setting when i shot with my modified Canon 350d
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