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tommyhawk13
sage
Reged: 09/28/07
Posts: 492
Loc: Jacksonville, Fl
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Cygnus redux
Yashica FX-2 with 50mm/1.7 ML with a UV filter
Provia 400F, at 10 minutes, wide open @ f/1.7
Homemade piggyback bracket attached to the front of my Starfinder 8, Jump starter powereing the RA drive,
and a home made reticle aimed at an out of focus star.
Er, um "hand guided", literally.
This was Saturday night's attempt at the Osceola National Forest, near Sanderson, Fl, affectionately called the Swamp.
Feel free to manipulate, since I just discovered that my hotoshop Elements does not have the curves function.
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Meade Starfinder 8,Meade SN-8 OTA, Orion Atlas, and a handfull of film cameras
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microbes
Pooh-Bah
Reged: 12/12/04
Posts: 1192
Loc: Romulus, Sector 12
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There is more there than it looks like. This is just a quick job to see what could be stretched out of it:
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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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tommyhawk13
sage
Reged: 09/28/07
Posts: 492
Loc: Jacksonville, Fl
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Do you think the vignetting is from teh wide open aperature, or from the UV filter that I couldn't pry off of the lens?
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Meade Starfinder 8,Meade SN-8 OTA, Orion Atlas, and a handfull of film cameras
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novbabies
Postmaster
Reged: 06/05/05
Posts: 15678
Loc: Northern Georgia!
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Quote:
There is more there than it looks like. This is just a quick job to see what could be stretched out of it:
Nice, you've teased out the NA Nebula  !!
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Good Seeing!
Mark
Orion 12" XTi f/4.9
VERY old Edmund 6" f/8 reflector
Assorted binoculars
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microbes
Pooh-Bah
Reged: 12/12/04
Posts: 1192
Loc: Romulus, Sector 12
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Quote:
Do you think the vignetting is from teh wide open aperature,
Probably. I get the same thing shooting at f/1.9.
Quote:
Nice, you've teased out the NA Nebula !!
Up in the top right corner? I saw the red but I was sure which nebula it was.
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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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Mike D
scholastic sledgehammer
Reged: 08/15/07
Posts: 855
Loc: South GA
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North America Nebula. Great Start! Try stopping down to f/2.8 and that should help with the vignetting.
I wonder if you might get more detail with no filter?
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Vixen SXD
Vixen ED80Sf
Hutech 350D
STI Stiletto
Meade 2080
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tommyhawk13
sage
Reged: 09/28/07
Posts: 492
Loc: Jacksonville, Fl
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The filter was stuck to the lens barrel. I'll see what I can do this week to get it off, but that's what I was thinking.
Since I don't have a drive corrector, I was guiding the scope with my hand on the end of the tube. I didn't want to risk a longer exposure, but this experiment worked out well enough that I'll give 20-30 minutes @ 2.8 a try, if I can hold out that long.
I tried to make a corrector from a kit that I bought, but it didn't work. I'll revisit that project as well.
Another idea I am tossing around is mounting the camera and an old Meade 60mm refractor to a piece of plywood, and bolting the assembly to the eq pier. That should cut down the weight enough to track better by just the RA motor.
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Meade Starfinder 8,Meade SN-8 OTA, Orion Atlas, and a handfull of film cameras
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AstroBobo
sage
Reged: 07/04/07
Posts: 395
Loc: Zagreb, Croatia
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To calculate exposure times, a good starting poind is to expose for "f-stop squared" minutes when using 400 ASA film and average skies (LM 5-6). So, 10 minutes @ f/2.8 should be more than enough, expose longer and you will only capture more sky fog. Experiment to see what is best for your observing/astrophoto site.
You should definitely stop down the lens two stops to improve sharpness. You'll always have some vignetting or uneven illumination of the FOV, but this can be dealt with the help of PixInsight.
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Boris Stromar : AD Infinitum member : Zagreb, Croatia, Europe
P75SDHF : P105SDP : MN71 : CGE : STL-11000
http://www.astrobobo.net
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