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Old 30-11-2011, 02:49 AM
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Tandum (Robin)
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2118 Revisited.

I had another shot at the Witch from 10 Chain Hill on the weekend. I got about 6 hours worth of RGB with Red coming up a little short due to some bad subs. After it crossed meridian I decided not to flip for Red as the scope was clear of the legs. It appears there was some cable drag or something while the mount was upside down and I lost about 40 minutes worth of Red. The sun was on the rise when I noticed it.

So 14xBlue, 12xGreen, 7xRed, 10minute subs Tak FS60 @ F6.2, 380mm FL.
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Old 30-11-2011, 08:21 AM
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Nice, Robin! You got a lot more this time.
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Old 30-11-2011, 08:39 AM
WingnutR32 (Sam)
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Wow, I really like that Witch, Tandum!

Well done!
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Old 30-11-2011, 09:15 AM
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Very nice!
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Old 30-11-2011, 04:49 PM
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A great shot Robin.

A couple of the brighter stars are showing the small wells of the KAF8300 chip. Those few stars are overexposed and have a largish halo. Not very pronounced in this image but this shows up more noticeably in fast larger refractors.
For example if Mike used one of those chips on his AG12 it would really be a problem.

You may get better looking stars with 5 minute or 7.5 minute subs. I judge exposure length by the maximum before the brightest stars start to spill over. For my scopes that is about 5 minutes.

10 minutes is fine at F8 and long focal length but wide field and fast the small wells damage the bright stars first and generally speaking you will lose colour info as too many wells become saturated.

It probably is a low noise camera so there isn't much of an issue of stacking more. It makes tracking easier too.

Greg.
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Old 30-11-2011, 10:14 PM
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ozstronomer (Geoff)
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Great shot Robin, nice FOV.
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Old 30-11-2011, 11:06 PM
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RobF (Rob)
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Congrats on a great image Robin. Really happy for you after all the effort you've put into this sucker!
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Old 01-12-2011, 03:28 AM
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One of my favourites. Love it and well done Robin!!

Darrin...
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  #9  
Old 01-12-2011, 08:51 AM
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Quote:
Originally Posted by RickS View Post
Nice, Robin! You got a lot more this time.
I could even see an outline of it in the red subs with screen stretch on high Rick, so a dark site makes a huge difference.

Quote:
Originally Posted by WingnutR32 View Post
Wow, I really like that Witch, Tandum!

Well done!
Quote:
Originally Posted by atalas View Post
Very nice!
Cheers guys, I had a few goes at it from home without a lot of success.


Quote:
Originally Posted by gregbradley View Post
A great shot Robin.

A couple of the brighter stars are showing the small wells of the KAF8300 chip. Those few stars are overexposed and have a largish halo. Not very pronounced in this image but this shows up more noticeably in fast larger refractors.
For example if Mike used one of those chips on his AG12 it would really be a problem.

You may get better looking stars with 5 minute or 7.5 minute subs. I judge exposure length by the maximum before the brightest stars start to spill over. For my scopes that is about 5 minutes.

10 minutes is fine at F8 and long focal length but wide field and fast the small wells damage the bright stars first and generally speaking you will lose colour info as too many wells become saturated.

It probably is a low noise camera so there isn't much of an issue of stacking more. It makes tracking easier too.

Greg.
The blue channel seems to bloat a bit on this FS60 Greg. See the attached image of the top left image star from the Green and Blue channels. Notice the small stars are tighter in the blue, only the big ones seem to bloom. That Blue has been deconvolved though. I know I don't have the flattener spacing exact on this scope and I think this is why I have to robofocus between colours. 10 minutes seems to be ok on my other scopes from Peters place and Blue doesn't bloom on them either.

Quote:
Originally Posted by ozstronomer View Post
Great shot Robin, nice FOV.
Quote:
Originally Posted by RobF View Post
Congrats on a great image Robin. Really happy for you after all the effort you've put into this sucker!
Quote:
Originally Posted by midnight View Post
One of my favourites. Love it and well done Robin!!

Darrin...
Cheers guys, I've been after a pic of this for a few years but it's so big it's hard to fit it into a normal view. Good old FS60, a surprising little scope and it works well from a dark site
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  #10  
Old 11-12-2011, 03:28 PM
Ross G
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Looks good Robin.

Ross.
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