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Comments for this Album [return to album] Gallery: Wycombe Astronomical Society - Image Gallery  Album: Galaxies    From: Wycombe Astronomical Society Members  Sat 24 Apr 2010 01:30:10 PM CDT Another good image Ben. This is a really nice result with a Canon 450D. I usually see images like these using a CCD camera instead. It gives me hope! Jan Dell From: Wycombe Astronomical Society Members  Sun 22 Aug 2010 02:44:30 PM CDT Nice one Ben. Plenty of detail. You might want to try NCG7331, a nice spiral that's not so edge on and visible now. Chris     From: Wycombe Astronomical Society Members  Tue 13 Apr 2010 03:27:02 AM CDT As you say a lot of galaxies. Some of them just look like stars. A nice collection David. Do you use bulb on the Canon? Are some of the exposures dark frames? Jan From: Wycombe Astronomical Society Members  Tue 13 Apr 2010 10:50:58 AM CDT I’ve given up using dark frames Jan. They don’t seem seem to make much difference. The camera was set to ‘bulb’ and the exposures made using a Hahnel Gigo Pro wireless remote control. A nice gadget that works at a distance of up to 100m.     From: Wycombe Astronomical Society Members  Sat 10 Apr 2010 03:33:05 PM CDT Nice one Alistair, I can see colour in my future.. Was there a previous version with a magenta cast? Chris From: Wycombe Astronomical Society Members  Mon 12 Apr 2010 01:49:01 AM CDT Hi Chris. This is my third go at M51 - previous ones not much good and I can't remember if I posted them. But "magenta cast" sounds plausible! Recently deleted a lot from the gallery because it wasn't my better stuff and it had been there long enough. From: Wycombe Astronomical Society Members  Mon 12 Apr 2010 01:56:34 AM CDT Such long exposures are vastly more resilient to noise appearing in the processing. Which is stating the obvious, but long nights of patience in the image acquisition has its rewards. Also got several hours of M101 and M63 this week. A From: Wycombe Astronomical Society Members  Mon 12 Apr 2010 02:00:43 AM CDT I didn't spend much time on this and am sure I can get more out of it. I'll have another go when I get back to UK. A From: Wycombe Astronomical Society Members  Tue 13 Apr 2010 03:38:29 AM CDT What a lovely image Alistair. Please can you explain the settings in more detail for me as I don't understand some of it. 05.12.5" RC,STL11000M please? Is this taken with a new piece of kit? i.e. Richey Cretien 'scope. From: Wycombe Astronomical Society Members  Tue 13 Apr 2010 03:38:55 AM CDT Sorry should have signed off the last post with my name. Jan From: Wycombe Astronomical Society Members  Tue 13 Apr 2010 04:47:42 PM CDT Hi Jan, this is 5 hours of total exposure time over two nights, 2010.04.04 and 2010.04.05. Sub-exposures were 10mins each: 16L 4R 5G 5B unbinned. Plus darks, bias and flats. From: Wycombe Astronomical Society Members  Tue 13 Apr 2010 04:58:33 PM CDT Camera is SBIG STL11000M 11Mp monochrome operating at -35C. Scope is RCOS 12.5inch f/9 RC mounted on AP GTO1200. Image processed in MaximDL and Photoshop.     From: Wycombe Astronomical Society Members  Mon 22 Mar 2010 02:51:56 PM CDT Have just seen your first attempt with the new CCD. It is a nice image. I am sure you are very pleased with the result, and there will be lots more to come. Jan     From: Wycombe Astronomical Society Members  Tue 09 Mar 2010 02:42:58 AM CST Please can you give more details on camera settings, number of frames,exposure times and processing of images if any. I would like to know how you arrived at the result. A nice image. Jan From: Wycombe Astronomical Society Members  Wed 10 Mar 2010 02:57:34 PM CST I took about 40, 30" exps at ISO 1600 (no dark frames), plus a few at 1 and 2 minutes to record fainter detail. The jpeg images were then stacked in Deep Sky Stacker. The result was then tweaked in Photoshop (Curves, noise reduction and unsharp mask)     From: Wycombe Astronomical Society Members  Wed 24 Feb 2010 02:41:35 AM CST I like this image Chris, the CCD is obviously working well. Jan     From: Wycombe Astronomical Society Members  Thu 30 Oct 2008 01:36:55 AM CDT David this is great if it was taken in our light pollution - is it filtered (why monochrome?). Exposure details? Fast aperture? Alistair From: Wycombe Astronomical Society Members  Fri 31 Oct 2008 05:04:01 AM CDT Alistair. Usual Amersham light pollution. No filter but target at zenith. F5.6, ASA 1600, Exps 30, 60 & 120 secs stacked together in DSS. After tweaking in PSP and PS 6 variable colour casts apparent so saturation reduced. David     From: Wycombe Astronomical Society Members  Fri 10 Oct 2008 02:54:15 PM CDT A nice image David. Did you use your Williams Optics 80mm'scope for this one? Jan From: Wycombe Astronomical Society Members  Fri 10 Oct 2008 05:17:55 PM CDT Hi Jan. There was no telescope involved, just the camera and its zoom lens connected directly with a pan and tilt head to my polar aligned mount. David     From: Wycombe Astronomical Society Members  Wed 01 Oct 2008 06:21:04 AM CDT Is this like using a Hartmann mask? I have never heard of a Bahnitov mask. What is the star that you have focussed on? Jan Jan From: Wycombe Astronomical Society Members  Wed 01 Oct 2008 11:49:43 AM CDT Yes, it's like a Hartmann mask but more complex to make. I'll bring one along on Thursday. You focus by getting the central spike between the two angled ones. Chris     From: Wycombe Astronomical Society Members  Wed 01 Oct 2008 06:18:25 AM CDT This is a nice image showing the 3 Messier objects. Jan     From: Wycombe Astronomical Society Members  Tue 10 Jun 2008 02:18:34 AM CDT Nice images Sandy! Are you mounted Alt Az? Chris From: Wycombe Astronomical Society Members  Tue 10 Jun 2008 02:34:45 AM CDT Thanks, Chris. Yes Alt-Az mount, though thinking of getting a wedge. Mounting the scope weighing 59 lbs each time seems daunting. Sandy From: Wycombe Astronomical Society Members  Tue 10 Jun 2008 04:54:08 PM CDT Getting the scope on a wedge is more difficult :-) Not only do you need to lift it but you have to tilt it. Chris     From: Wycombe Astronomical Society Members  Fri 11 Apr 2008 04:13:11 PM CDT Wow! What great images David.     From: Wycombe Astronomical Society Members  Fri 29 Feb 2008 02:17:36 AM CST You are obviously enjoying your Onyx scope and CCD and getting some pleasing images. Jan     From: Wycombe Astronomical Society Members  Fri 29 Feb 2008 02:14:23 AM CST A nice image Chris. Jan     From: Wycombe Astronomical Society Members  Tue 19 Feb 2008 04:41:34 PM CST This is an interesting one Chris. Jan     From: Wycombe Astronomical Society Members  Tue 19 Feb 2008 04:42:58 PM CST No mistaking this one David, very nice. Jan     From: Wycombe Astronomical Society Members  Wed 13 Feb 2008 07:03:48 AM CST That's a good image Sandy; can you say something about how you acquired and processed it please. Things like the type of scope, type of imager (DSI of some sort I suppose), exposure, number of frames and processing. - Chris From: Wycombe Astronomical Society Members  Tue 19 Feb 2008 04:44:12 PM CST That is a very nice image Sandy. Jan From: Wycombe Astronomical Society Members  Wed 20 Feb 2008 03:48:21 AM CST Image taken with DSI II through my Celestron 9.25" scope. About 40 images stacked on the fly, 30 sec exposures. Processing by Fred Stevenson using Photoshop, Maxim DL etc.     From: Wycombe Astronomical Society Members  Sat 17 Nov 2007 04:29:34 PM CST That's a very nice image David, It shows how large M31 is is you need to use a focal reducer with a DSLR. Chris From: Wycombe Astronomical Society Members  Sun 18 Nov 2007 04:00:45 AM CST Yes the galaxy filled almost the whole frame, just a bit trimmed from right and bottom for the final image. Good luck with your new 80mm refractor. David From: Wycombe Astronomical Society Members  Thu 27 Dec 2007 01:39:41 PM CST I particularly like this one. To get 2 minute exposures on the Canon 400D did you use "bulb"? Jan From: Wycombe Astronomical Society Members  Thu 27 Dec 2007 01:41:01 PM CST Me again! I meant to ask what is an ALP filter please. Jan From: Wycombe Astronomical Society Members  Tue 01 Jan 2008 02:49:42 PM CST Hi Jan, I have posted an answer to your queries in the forum under ‘Astronomy Chat’. David     From: Jan Dell  Sat 20 Oct 2007 02:16:10 AM CDT A nice picture David. Are you using bulb to get a 2 minute exposure? I have not tried bulb, and have not gone beyond 30 second exposures. From: Wycombe Astronomical Society Members  Tue 30 Oct 2007 06:19:02 PM CDT Yes I use the bulb setting with a remote release (bought from Chesham photographic). Also a large bag clip to hold the button down for the 2 min exposures. David     From: Jan  Wed 07 Feb 2007 10:08:29 AM CST I have taken to viewing the image gallery more often recently, and came across this picture. I thought it was really lovely, and showed M45 so clearly. From: Jan  Wed 07 Feb 2007 10:10:13 AM CST I took another look and realised that Taurus was also a good view in the upper right corner.     From: Jan  Wed 07 Feb 2007 10:12:57 AM CST Another good picture. I wonder if you took this with your new IS lens. Did you have to use a tripod? From: David  Thu 08 Feb 2007 05:22:47 AM CST This was taken with the EOS 400 connected directly to the telescope using a T-ring adaptor and extension tube.   Gallery: Wycombe Astronomical Society - Image Gallery  Album: Galaxies  Powered by Gallery v1 RSS

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