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PostPosted: Sat Sep 20, 2008 11:44 am 
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But I know how to go about it :D

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This was taken using the Canon 40D on a 5x Barlow attached to a Sky 90. Everything sitting on a camera tripod. I let the Moon drift across the frame (no tracking) and took shots as it went by. Something like 1/8 second at ISO 100. About 30 frames made up this mosaic, but if you were tracking and placing the camera where you wanted to take the shot you could do it in about 6 or 8 frames.

To do better than this:
1) Track the Moon with a guided mount (AstrTrac TT320X would probably do fine).
2) Check focus with the liveview feature for each frame.

Greg

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Nexstar 11 GPS, 2 x Sky 90, M25C, MaximDL, Photshop CS3, Noel Carboni's Photoshop actions, 7 foot Pulsar fibreglass dome, Canon 40D, 100mm macro lens, 28-200mm zoom lens, 17-55mm f#2.8 zoom lens, 100-400mm zoom lens, 1.4x converter, 2x converter.
http://www.newforestobservatory.com/
http://www.flickr.com/photos/12801949@N02/


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PostPosted: Fri Oct 17, 2008 11:55 am 
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This is really interesting. I have used this technique with star trails i.e. taking 150 30sec shots to build up 1hrs worth of trails and compositing but I didn't think about trying this with the moon.

What are the advantages of doing this over taking one shot? What did you use to composite them?

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PostPosted: Sat Oct 18, 2008 7:30 am 
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Photomerge in CS3 was used. How would you get the resolution in one shot?
Greg

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Nexstar 11 GPS, 2 x Sky 90, M25C, MaximDL, Photshop CS3, Noel Carboni's Photoshop actions, 7 foot Pulsar fibreglass dome, Canon 40D, 100mm macro lens, 28-200mm zoom lens, 17-55mm f#2.8 zoom lens, 100-400mm zoom lens, 1.4x converter, 2x converter.
http://www.newforestobservatory.com/
http://www.flickr.com/photos/12801949@N02/


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PostPosted: Sat Oct 18, 2008 9:51 am 
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This was my question Greg.

Am I understanding what you have done? Did each of your shots have the entire moon in it? Or only parts which were stitched together?

I think I may have been getting confused and was wondering the advantages of compositing several shots of the entire moon together.

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PostPosted: Sat Oct 18, 2008 11:16 am 
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cybermystic wrote:
Photomerge in CS3 was used. How would you get the resolution in one shot?
Greg

Maybe it is just me but it looks as if the photo is diffused at the top … the rest is much better … is this caused by some problems in the image stacking process?


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PostPosted: Sun Oct 19, 2008 8:14 am 
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Ahh - sorry, didn't see it wasn't made clear at the beginning - mea culpa!!! This was taken with a 5x Barlow so focal length around 2500 mm, so I only get a small chunk of Moon in each frame.

I think you'll find it's "diffused" all over - it's not a good idea to use a long focal length and no tracking, there's bound to be some movement, the Moon moves very quickly across the FOV at 2500 mm!

Greg

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Nexstar 11 GPS, 2 x Sky 90, M25C, MaximDL, Photshop CS3, Noel Carboni's Photoshop actions, 7 foot Pulsar fibreglass dome, Canon 40D, 100mm macro lens, 28-200mm zoom lens, 17-55mm f#2.8 zoom lens, 100-400mm zoom lens, 1.4x converter, 2x converter.
http://www.newforestobservatory.com/
http://www.flickr.com/photos/12801949@N02/


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PostPosted: Sun Oct 19, 2008 8:21 am 
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Ah that clarifies it a lot. wow 2500mm that sounds cool.

One question though - why was the shutter so slow? It is a result of connecting to your telescope?

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PostPosted: Sun Oct 19, 2008 3:07 pm 
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Shutter was slow because I chose to work at ISO 100 for minimum noise. I could have used a faster shutter speed by using an ISO above 100. There's a lot of swings and roundabouts with astronomical imaging ;)
Greg

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Nexstar 11 GPS, 2 x Sky 90, M25C, MaximDL, Photshop CS3, Noel Carboni's Photoshop actions, 7 foot Pulsar fibreglass dome, Canon 40D, 100mm macro lens, 28-200mm zoom lens, 17-55mm f#2.8 zoom lens, 100-400mm zoom lens, 1.4x converter, 2x converter.
http://www.newforestobservatory.com/
http://www.flickr.com/photos/12801949@N02/


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PostPosted: Sun Oct 19, 2008 3:58 pm 
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ok, I get that, thanks for clarifying Greg :-D

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