· Get a Cloudy Nights T-Shirt · Submit a Review / Article    Click here if you are having trouble logging into the forums Cloudy Nights - Official Forums of the 2009 International Year of Astronomy Privacy Policy | Please read our Terms of Service | Signup and Troubleshooting FAQ | Problems? PM a Red or a Green Gu.... uh, User   You are not logged in. [Login] Forum Archives · Entrance · Main Index · Search · New user · Who's Online FAQ · Calendar Astrophotography and Sketching >> DSLR & Digital Camera Astro Imaging & Processing Previous   Index   Next   Threaded   Pages: 1 RStar scholastic sledgehammer Reged: 03/04/06 Posts: 782 Loc: New Jersey Horsehead Revisited       #2100528 - 01/06/08 10:15 AM Edit   Reply   Quote Quick Reply   Hi all, I was able to add some subs to my B33 image this week. I deleted all the earlier subs that were shot with the moon present. Here's what I wound up with. 3H 49 minutes exposure. Orion ED80 and WO StageII 0.8 FF/FR, CGE mount, Hap modified 350XT with Baader UHC-S and IR/UV cut filters, Exposure 12-29-07 20x300 second 800 iso subs ST-4 guided 1-3-08 43x180 second 1600 iso subs unguided, Bortle 7 skies Large version 800k http://www.pbase.com/bobstarzynski/image/91274417/original Thanks for looking Bob -------------------- Celestron CGE Orion 190 Mak-Newtonian TeleVue NP101 Orion ED80 WO 66 SD ST-4 guider Hap Modified 350XT http://www.pbase.com/bobstarzynski/astro_imaging Post Extras:       Strgazr27 Vendor - Deep Space Mods and Composites Reged: 10/04/04 Posts: 6984 Loc: StonyHill Observatory Re: Horsehead Revisited [Re: RStar]       #2100562 - 01/06/08 10:41 AM Attachment (17 downloads) Edit   Reply   Quote Quick Reply   Bob, Big difference with the new subs. I hope you don't mind, I went in a balanced the color a bit better (Something I am having a hard time doing on my images hence the practice). The black point was clipped a bit but there is a lot of info there for the amount and time of subs. I do have a question. I see a bunch of guys shooting at ISO 1600 and was curious as to why? From what I have read you lose dynamic range and add noise. The thing I see is some shots are real nice at 1600 (Yours) but others I have seen look pretty nasty. Any thoughts? CS's -------------------- Bobby StonyHill Observatory Skywatcher EQ6 Pro (On it's way) AT 130 F/6 Prototype Royce 10" f/4 Astrograph (Under Construction) Self Modded 40D 70-200 F2.8 L IS SSAG YAHOO TMB 130SS Group Astronomy Technologies Yahoo Group Post Extras:       weatherandsky Carpal Tunnel Reged: 12/27/06 Posts: 1848 Loc: Ontario, Canada Re: Horsehead Revisited [Re: Strgazr27]       #2100619 - 01/06/08 11:11 AM Edit   Reply   Quote Quick Reply   Beautiful Bob! I compared it to your last and I definately like this version better. Stargazer your reporcess looks very nice as well. As for shooting at ISO 1600... I usually do so once the temperatures gets below 0C(32F). Otherwise it's ISO 800. -------------------- Kerry * Weather and Sky Photography * QHY-8, Canon 40D unmodded, Meade DSI-C Meade 12" LightBridge Astro-Tech 8in RC Celestron C6-SCT Sky-Watcher Equinox 80mm APO Omcon 4.5" Newt Celestron Skymaster 15x70 Canon 50 f1.8, 100 f2.8Macro, 100-400 f4.5-5.6L, Sigma 17-70, 18-50, 28-300 CGE, CG-5 GT Post Extras:       RStar scholastic sledgehammer Reged: 03/04/06 Posts: 782 Loc: New Jersey Re: Horsehead Revisited [Re: Strgazr27]       #2100636 - 01/06/08 11:21 AM Edit   Reply   Quote Quick Reply   Thanks Bobby and Kerry, Bobby, I like what you did with the image. Sometimes, in an effort to preserve faint detail, I lose track of the overall picture 1600 iso really wasn't the optimum setting for the second set of subs. The dynamic range did suffer a bit and the star image size was larger. The only reason I opted for it this time is that the CGE can track perfectly unguided for 180 seconds. I didn't feel that 180 second 800 iso subs would add signicantly to the image and I just didn't have it in me that night to set up the ST-4 for 300 sec subs Bob -------------------- Celestron CGE Orion 190 Mak-Newtonian TeleVue NP101 Orion ED80 WO 66 SD ST-4 guider Hap Modified 350XT http://www.pbase.com/bobstarzynski/astro_imaging Edited by RStar (01/06/08 11:24 AM) Post Extras:       Strgazr27 Vendor - Deep Space Mods and Composites Reged: 10/04/04 Posts: 6984 Loc: StonyHill Observatory Re: Horsehead Revisited [Re: RStar]       #2100810 - 01/06/08 12:50 PM Edit   Reply   Quote Quick Reply   Bob, I suffer the same problem with processing Lol. That makes sense with the guiding. CS's -------------------- Bobby StonyHill Observatory Skywatcher EQ6 Pro (On it's way) AT 130 F/6 Prototype Royce 10" f/4 Astrograph (Under Construction) Self Modded 40D 70-200 F2.8 L IS SSAG YAHOO TMB 130SS Group Astronomy Technologies Yahoo Group Post Extras:       Mike B. Carpal Tunnel Reged: 10/24/05 Posts: 1687 Loc: Louisiana Re: Horsehead Revisited [Re: Strgazr27]       #2100944 - 01/06/08 02:01 PM Edit   Reply   Quote Quick Reply   Very nice! I like the re-worked image, too. -------------------- Clear skies! Mike B. My Homepage and Astrophotos Post Extras:       Star surfer8 super member Reged: 05/15/06 Posts: 494 Re: Horsehead Revisited [Re: Mike B.]       #2101003 - 01/06/08 02:25 PM Edit   Reply   Quote Quick Reply   RStar, Very smooth and good detail. Great job! -------------------- Tom Post Extras:       s58y Postmaster Reged: 12/12/04 Posts: 5510 Loc: Eastern NY Re: Horsehead Revisited [Re: Star surfer8]       #2101144 - 01/06/08 03:30 PM Edit   Reply   Quote Quick Reply   Excellent H+flame image. The faint outer red nebulosity shows up well in this shot. Getting rid of the shots taken with the moon seems to have helped. (I also gave up shooting with the moon out, even when using narrowband H-alpha filters.) -------------------- Hutech 30D, SBIG ST-402 autoguider SV80S, TV102iis Old camera lenses: 800mm f/5.6, 180mm f/3.4 AP900, Barndoor tracker http://www.pbase.com/s58y Post Extras:       RStar scholastic sledgehammer Reged: 03/04/06 Posts: 782 Loc: New Jersey Re: Horsehead Revisited [Re: s58y]       #2101599 - 01/06/08 06:49 PM Edit   Reply   Quote Quick Reply   Thanks Mike, Tom and s58y. Bob -------------------- Celestron CGE Orion 190 Mak-Newtonian TeleVue NP101 Orion ED80 WO 66 SD ST-4 guider Hap Modified 350XT http://www.pbase.com/bobstarzynski/astro_imaging Post Extras:       novbabies Postmaster Reged: 06/05/05 Posts: 15678 Loc: Northern Georgia! Re: Horsehead Revisited [Re: RStar]       #2101687 - 01/06/08 07:26 PM Edit   Reply   Quote Quick Reply   Bob, beautiful image, reprocessed is spectacular too !! -------------------- Good Seeing! Mark Orion 12" XTi f/4.9 VERY old Edmund 6" f/8 reflector Assorted binoculars Post Extras:       Pages: 1 Previous   Index   Next   Threaded   Extra information 3 registered and 11 anonymous users are browsing this forum. 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