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Orpington Astronomical Society

Astronomy => Astrophotography => Topic started by: Carole on Oct 09, 2016, 16:41:39

Title: Melotte 15 (Reprocess)
Post by: Carole on Oct 09, 2016, 16:41:39
Was feeling quite ashamed of my previous process of this target see previous post, so I had another "go" at it today and I think this is much better. 

(http://cdn.astrobin.com/images/thumbs/d78c734dfed2e8bc694004eace68572f.1824x0_q100_watermark.jpg)

Original details are:
Ha 9 x 900 secs
Oiii & Sii each 7 x 450 secs binned
Atik 314L & SW 150P

Original post:
http://forum.orpington-astronomy.org.uk/index.php?topic=10841.0

Carole
Title: Re: Melotte 15 (Reprocess)
Post by: Fay on Oct 09, 2016, 22:44:53
More 3d now Carole!
Title: Re: Melotte 15 (Reprocess)
Post by: Carole on Oct 09, 2016, 22:47:57
Some-one else said that too.

Carole
Title: Re: Melotte 15 (Reprocess)
Post by: MarkS on Oct 09, 2016, 23:23:00
Very nice result!

Mark
Title: Re: Melotte 15 (Reprocess)
Post by: Carole on Oct 10, 2016, 09:03:20
Thanks Mark. 

Regarding the flattened stars, some-one on another forum suggested - what I feared - that the focusser is projecting into the tube.  Since that is the point of my focus, not a lot I can do about it, I have still to take a look and see if that is the case, and seems the only option is to saw a bit of the focusser.  Hmmm, definitely not a job for me if that's the solution.   

I have a smaller 130PDS on the way as I wanted a bigger FOV, so might sell the 150P on if I get a buyer. 
Also standby for clouds.  :! :!

Carole
Title: Re: Melotte 15 (Reprocess - reprocessed!)
Post by: Carole on Oct 10, 2016, 15:42:21
I wasn't happy with the sky background, so here is a revised version:

(http://cdn.astrobin.com/images/thumbs/724f5bab0ee62f3233bd09c776b43cd7.1824x0_q100_watermark.jpg)
Title: Re: Melotte 15 (Reprocess)
Post by: MarkS on Oct 10, 2016, 19:19:46
Quote from: Carole
Regarding the flattened stars, some-one on another forum suggested - what I feared - that the focusser is projecting into the tube. 

Of course - I should have thought of that.  It will explain the strong spike in one direction.  A possible solution is to make a crescent shape mask for the front of the tube that will "hide" the intrusion of the focuser into the light path.

Mark
Title: Re: Melotte 15 (Reprocess)
Post by: Carole on Oct 10, 2016, 19:31:55
That sounds like a good idea Mark.  I am hoping to sell the 150P, so not going to worry about it for now.  Just hope the 130PDS does not have the same problem.

Carole
Title: Re: Melotte 15 (Reprocess)
Post by: Carole on Oct 11, 2016, 12:08:20
Well that was handy -
Quoteso might sell the 150P on if I get a buyer
Duncan picked up on this comment and has just collected the scope from me, so didn't even have to advertise it.

Watch out for Duncan larger FOV images.

Carole
Title: Re: Melotte 15 (Reprocess)
Post by: JohnP on Oct 13, 2016, 21:09:17
Very nice Carole - background looks a lot better - John
Title: Re: Melotte 15 (Reprocess)
Post by: Carole on Oct 13, 2016, 21:28:42
Thanks John, I remember you saying this was your favourite part of the sky.

Carole
Title: Re: Melotte 15 (Reprocess)
Post by: JohnP on Oct 14, 2016, 12:31:58
Blimey - you've got a good memory.. Yes I can remember the first time I imaged this & being amazed at all the knots & twirls when I processed it.. John
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