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#1
Announcements, Meetings, Events / Perseid watch.
Last post by doug - Aug 09, 2022, 09:28:12
     The Observing Officer is holding a Perseid watch at Chelsfield Green this coming Friday ... see the OAS WhatsApp site for further details ... so the Otford Hall team are holding a second Perseid viewing in the field behind the Hall on Saturday, 13th August, for those people who cannot attend the Friday viewing. If you think you have missed it, come along Saturday at about 20.30 hrs.

      Doug and Rose.
#2
Astrophotography / Re: NGC 6914 and gas clouds ne...
Last post by ApophisAstros - Aug 08, 2022, 13:12:26
Mine was SHO.
👍
#3
Astrophotography / Re: NGC 6914 and gas clouds ne...
Last post by The Thing - Aug 08, 2022, 10:46:42
Quote from: ApophisAstros on Aug 07, 2022, 20:05:06Nice , Duncan did you see my wider field of the same target on 7th July.?
Roger

Hi Roger, Yes I did, that is a very nice image. Strange mine ended up the same sort of colour scheme :o.

My l-Enhance filter emulates Ha and OIII filters with a bit of Hb thrown in for luck so I suppose when I used SCNR "The Subtractive Chromatic Noise Reduction (SCNR) technique has been implemented mainly to deal with green noisy pixels." it completely changed the colour balance that had been set in the previous step by replacing the green pixels by its magic method.
#4
Astrophotography / Re: NGC 6914 and gas clouds ne...
Last post by Carole - Aug 08, 2022, 10:11:14
That's a really nice result for this target, the dark nebulae are showing up well as are the blue reflection nebulae.  As you say it has come out a strange colour, I bet it is that SNCR that caused it.  Particularly nice considering it was done with your old slow SCT. 

Carole

#5
Astrophotography / Re: NGC 6914 and gas clouds ne...
Last post by ApophisAstros - Aug 07, 2022, 20:05:06
Nice , Duncan did you see my wider field of the same target on 7th July.?
Roger
#6
Astrophotography / NGC 6914 and gas clouds near S...
Last post by The Thing - Aug 07, 2022, 19:23:53
I don't know why the colour went this way but I quite like it. The only thing I did differently was use SNCR after Photometric Colour Calibration before everythng else. I'm still amazed I can get this out of my old Meade SCT which never used to produce nice pics nearly to the edge of frame!

This is 110x120s (3h40m) light frames uncroppped, 20 dark, 10 dark flat, 10 flat, at Gain 1600 (Unity camera gain = 1 photon = 1 electron), Offset 30, Temp-5C.

Image date, time and location:           2022-08-06, Manche, France
Telescope aperture and focal ratio:   Meade LX90 8" UHTC, Baader Alan Gee II Telecompressor at f6
Camera and filters used:           QHY294PROC, Optolong l-enhance tri-band filter
Processing applied:                   Pixinsight, Affinity Photo

#7
Astrophotography / Re: NGC 6888 Crescent Nebula c...
Last post by The Thing - Aug 06, 2022, 08:17:44
Thanks Carole.
#8
Astrophotography / Re: NGC 6888 Crescent Nebula c...
Last post by Carole - Aug 02, 2022, 14:22:49
Very nice result Duncan.  Not commented before as I have been on holiday.  Those optolong filters do a good job.

Carole
#9
It's under more, not exactly obvious but will do. 

Carole
#10
Introductions / Re: A quick Introduction
Last post by RobertFinlay - Aug 01, 2022, 14:57:36
Hi Gavin,
Good to chat the other day and hope you enjoy your time with the OAS as well.  See you at the next observing evening.
Robert