osteomark
sage
Reged: 05/09/07
Posts: 478
Loc: Oswego, NY
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I shot through a 2" diagnal on SCT Meade LX 50 8". How long am I supposed to hold the shutter open on "B" mode. I did some 5 sec and 10sec exposures of Saturn, Mars and Orion nebulae and the tracking was horrific. I was bummed. I thought I could atleast get 10 sec before movement was apparent. The scope was polar aligned. I didn not bother turning on the RA and DEC. Maybe next time I'll do that.
Any sources I can go to for time exposures. Thanks.
I used a Hartman Mask and that worked well. How big should the triangles or holes be? I have 3 triangles with 3/4" sides. I definetly could see the 3 Sirius's or Saturns come to focus.
Thanks,
Mark
Edited by osteomark (03/07/08 04:03 PM)
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huckabuck
sage
Reged: 02/18/07
Posts: 267
Loc: statesboro, ga
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mark,
at prime focus you will have to track. there is essentually no time limit for an exposure without tracking with any "through the scope" method.the smaller your fov the worse trailing you will have. you can go 10 secs without tracking using wide-field only and then only with a shorter lens
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microbes
Pooh-Bah
Reged: 12/12/04
Posts: 1192
Loc: Romulus, Sector 12
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Quote:
Any sources I can go to for time exposures. Thanks.
go here:
http://www.covingtoninnovations.com/astro/astrosoft.html
And download the "Astrophotography exposure calculator".
It's a freebee, and I've found it to be very good.
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Dirt Cheap Astronomy
Voyager 114X900 Newt EQ2 * Sky Chief 60X700 EQ1 * Cometron 62X300 EQ1
Sears Ultra Wide 7X50 Binos * Vintage 16X50 Binos EQ1
Books, Barlows, Eyepieces, Camera Adaptors & Other Esoteric Junk.
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osteomark
sage
Reged: 05/09/07
Posts: 478
Loc: Oswego, NY
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I forgot to mention the Nikon FE has a T-adapter to a 1.25" opening not a 2" opening.
Thanks for the references. I can not wait to get Covingtons astrophoto book. Ordered it a week ago.
Mark
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Meade LX50 8"SCT
Magellan II autofinder
WO 1.25" binoviewer with 3-in-1 Sieberts OCA
Marcus Luden Intes Micro 703 Maksutov 7"
Meade LXD55 GEM mount
Syracuse, NY
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jrw11
professor emeritus
Reged: 06/09/07
Posts: 501
Loc: U.S.A.
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About the size of the holes for the Hartman ask.This might help.
http://billyard.servehttp.com/Hartmann.html
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Celestron C6n -HD Reflector
dual axis drive motors added
Orion 80mm Short tube refractor
Skyscout
Early 70's Pentax 7x50
Garrett Optical 12x60
Garrett Optical 15x70
Oberwerk 20x80 Standards
Canon Rebel Ti (film)
4 Minolta Srt cameras
Mamiya RB67 Pro-s with 180 lens
127mm KL lens for RB, Bellows hood for RB67
120 and 220 film backs
Cambo SCII 4x5 view camera
over 50 other film cameras
several eyepieces
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osteomark
sage
Reged: 05/09/07
Posts: 478
Loc: Oswego, NY
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the covington sight is not giving program after I download it.
Mark
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Meade LX50 8"SCT
Magellan II autofinder
WO 1.25" binoviewer with 3-in-1 Sieberts OCA
Marcus Luden Intes Micro 703 Maksutov 7"
Meade LXD55 GEM mount
Syracuse, NY
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microbes
Pooh-Bah
Reged: 12/12/04
Posts: 1192
Loc: Romulus, Sector 12
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Quote:
the covington sight is not giving program after I download it.
Hmmm... It has to be unzipped and then installed after you down load it, but I didn't have any problems setting it up. I know quite a few other people also use it, but perhaps there is a problem on the website right now.
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Dirt Cheap Astronomy
Voyager 114X900 Newt EQ2 * Sky Chief 60X700 EQ1 * Cometron 62X300 EQ1
Sears Ultra Wide 7X50 Binos * Vintage 16X50 Binos EQ1
Books, Barlows, Eyepieces, Camera Adaptors & Other Esoteric Junk.
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osteomark
sage
Reged: 05/09/07
Posts: 478
Loc: Oswego, NY
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Wow. I was not even close to the correct exposure time according to Covington in Astrophotography for the Amateur.
Saturn f/10 exposure 1/30sec. Mars 1/250sec. Now wonder there was trailing at 5-10secs without RA motor on!! At least photo place did not charge me.
Mark
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Meade LX50 8"SCT
Magellan II autofinder
WO 1.25" binoviewer with 3-in-1 Sieberts OCA
Marcus Luden Intes Micro 703 Maksutov 7"
Meade LXD55 GEM mount
Syracuse, NY
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osteomark
sage
Reged: 05/09/07
Posts: 478
Loc: Oswego, NY
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I got the file to unzip. Neat calculating website.
Mark
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Meade LX50 8"SCT
Magellan II autofinder
WO 1.25" binoviewer with 3-in-1 Sieberts OCA
Marcus Luden Intes Micro 703 Maksutov 7"
Meade LXD55 GEM mount
Syracuse, NY
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microbes
Pooh-Bah
Reged: 12/12/04
Posts: 1192
Loc: Romulus, Sector 12
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I'm glad you got it working. I normally "bracket" a shot both above and below what it recommends, but I've found it to be pretty accurate.
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Dirt Cheap Astronomy
Voyager 114X900 Newt EQ2 * Sky Chief 60X700 EQ1 * Cometron 62X300 EQ1
Sears Ultra Wide 7X50 Binos * Vintage 16X50 Binos EQ1
Books, Barlows, Eyepieces, Camera Adaptors & Other Esoteric Junk.
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Magellan
professor emeritus
Reged: 01/26/06
Posts: 518
Loc: Dartmouth, NS Canada
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You should post this on the software forum. There is NOTHING I have found on the internet that does this as a standalone product, they are all webapps.
It took me a while to find this post again. I wonder if we could have a best of software sticky on the software forum.
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Jeff D
Coulter Odyssey 2 8" Dobsonian
Celestron Nexstar 102SLT
Antares EQ-5 Mount
Celestron Skymaster 15x70
Messier Certificate Count: 71/110
St. Croix Observatory RASC-Halifax
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