Author Topic: M81/M101 now I've got guiding working again.  (Read 3600 times)

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RobertM

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M81/M101 now I've got guiding working again.
« on: Apr 01, 2008, 23:26:38 »
I think these are the first anyone has posted since Johns handful on the 9th March.  Need a few more clearish evenings to finish M101 off though.

I had planned to capture about 10 subs of M101 but there was a sharp metalic noise outside and the next frame had star trails so was useless (not quite sure what did happen) then the clouds rolled in....

http://gallery.orpington-astronomy.org.uk/albums/userpics/10031/Messier81-0XXlum300.jpg

http://gallery.orpington-astronomy.org.uk/albums/userpics/10031/Messier101-0XXlumXX0_reduced.jpg


Mike

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Re: M81/M101 now I've got guiding working again.
« Reply #1 on: Apr 01, 2008, 23:39:39 »
Very nice images Robert. Stars are nice and sharp.
We live in a society exquisitely dependent on science and technology, in which hardly anyone knows anything about science and technology. Carl Sagan

MarkS

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Re: M81/M101 now I've got guiding working again.
« Reply #2 on: Apr 02, 2008, 05:57:34 »

They're looking good - the guiding is certainly performing well.  I agree M101 needs more data.

What camera are you using?  And any light pollution filter?

JohnP

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Re: M81/M101 now I've got guiding working again.
« Reply #3 on: Apr 02, 2008, 07:38:49 »
Both very nice Robert - especially like the m81 - m101 is a very tough object - really low surface brightness..

Like Mike said it would be great if you could give a quick summary of scope/ camera & number/ length of subs when posting an image - So many people post now & setups etc. are always changing its hard to keep track of who images with what...

Great images though - John

RobertM

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Re: M81/M101 now I've got guiding working again.
« Reply #4 on: Apr 02, 2008, 08:33:02 »
Thanks Guys, I was a bit desperate to get something going after all the bad weather, wind and cloud.  There was a fair amount of high cloud so it wasn't particularly clear but enough to get something that turned out ok.  Background noise was a problem in both images, I really need a dark site !

Equipment in both cases was Celestron C9.25@F6.3, Starlight-Xpress SXV-H9 unbinned with Baader Neodymium filter for LP.

M81 - 18 x 300s - as far as I could go without saturating the galaxy core
M101 - 2 x 900s - wanted to push the boat out a little as I know it can be a tricky object.

Funny but since I changed my dew shield to a kendrick I've not had to use the dew heater once.

John, I'd had a crack at M81 before but it was dissapointing and wanted to do it again.  Then your image came along and set the benchmark so I had to try to make it half decent.  I'm pleased with the final result but I've still got a long way to go, especially in post processing.

Robert



Rick

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Re: M81/M101 now I've got guiding working again.
« Reply #5 on: Apr 02, 2008, 11:04:32 »
They look good. Please consider moving them to the main gallery.

Tony G

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Re: M81/M101 now I've got guiding working again.
« Reply #6 on: Apr 02, 2008, 11:58:32 »
Robert,

Two great images, especially M81,.......................... I need to get a CAMERA........................ :cry:.

Tony G
"I'm normally not a praying man, but if you're up there, please save me Superman." - Homer Simpson

RobertM

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Re: M81/M101 now I've got guiding working again.
« Reply #7 on: Apr 02, 2008, 13:52:03 »
Thanks Tony, it certainly helps having a camera.  If you're after one then it might be worthwhile looking at one of the two new Atik cameras, 1/2" format but the same res as mine.

Rick,  I'll put the full res M81 in the main gallery tonight, M101 is still work in progress but I'll post when ready.


Rick

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Re: M81/M101 now I've got guiding working again.
« Reply #8 on: Apr 02, 2008, 16:19:22 »
Thanks. :)

Fay

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Re: M81/M101 now I've got guiding working again.
« Reply #9 on: Apr 02, 2008, 18:45:43 »
Robert, nice to see that rare occurance, new images! Can't believe you found a clear bit of sky!

They are very nice, both of which I need to do soon. My M81 was not very good & I have never done M101.
Waiting for a good sky!

I too think that John's M81 is the benchmark!
It is healthier to be mutton dressed as lamb, than mutton dressed as mutton!

JohnP

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Re: M81/M101 now I've got guiding working again.
« Reply #10 on: Apr 02, 2008, 19:15:53 »
Robert - i'm sure if you are getting images that good from light polluted skies you'll get suberb images from a dark sky site.. I was fortunate that I took my m81 from my mother's house which is probably mag 6 or better - it still wasn't ideal though - kinda misty....

Cheers.  John

RobertM

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Re: M81/M101 now I've got guiding working again.
« Reply #11 on: Apr 02, 2008, 21:26:38 »
Full res image posted in the gallery http://gallery.orpington-astronomy.org.uk/albums/userpics/10031/Messier81-0XXlum300-2_copy.jpg

John, Yes the light polluted skies were a real problem, the background ADU was about 4500 in the calibrated M81 image.  Looking at your image you definitely win on the fainter outer edges and I think I would expect that given the better skies.  Wow mag 6 or better, now if only we could get another blackout :)

Fay

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Re: M81/M101 now I've got guiding working again.
« Reply #12 on: Apr 03, 2008, 07:56:06 »
Robert, really really nice, you did well there.
It is healthier to be mutton dressed as lamb, than mutton dressed as mutton!

RobertM

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Re: M81/M101 now I've got guiding working again.
« Reply #13 on: Apr 04, 2008, 18:37:33 »
Thanks Fay, I just now need to get the processing sorted ! Here's my first crude try using MaximDL DDP processing.

http://gallery.orpington-astronomy.org.uk/albums/userpics/10031/Messier81-0XXlum300_p2.jpg

Fay

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Re: M81/M101 now I've got guiding working again.
« Reply #14 on: Apr 04, 2008, 19:00:57 »
Robert you are certainly a force to be reckoned with!!  Fantastic image!!!!!!!!
It is healthier to be mutton dressed as lamb, than mutton dressed as mutton!