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FORUMS Photo Sharing & Visual Enjoyment Astronomy & Celestial 
Thread started 27 Oct 2010 (Wednesday) 15:45
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You don't need a telescope

 
archer1960
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Dec 08, 2012 09:54 |  #1216

R2duBot wrote in post #15338403 (external link)
Thanks!

By tracked, I mean my camera was mounted on an equatorial mount driven by motors that counteract the rotation of the Earth. This works well when you can achieve good polar alignment. (meaning your mount is exactly facing celestial north). It's fairly hard to get right, and I spend a considerable amount of time working on it. It allows me to take a 30 sec exposure (or longer) @ 200mm, without it I would be limited to about 2 sec @ 200mm.

Auto guiding is the next level up, by which another camera is mounted along side your scope (or whatever main lens you are imaging through), and hooked up to software that will follow a reference star, sending correction data to the motors on the mount, adjusting for any errors in tracking. At least that's how I understand it, maybe someone more experienced could fill in anything I missed. I don't have one of those systems, way out of my budget!

That is an accurate description of guiding, though they're not necessarily as expensive as you appear to think. I guide with an $80 finderscope, $90 (IIRC) webcam and free software on my cheap laptop. Of course you can spend much more if you want, just like you can for your tracking mount.

Nice job with your non-guided tracking; that's a great shot!


Gripped 7D, gripped, full-spectrum modfied T1i (500D), SX50HS, A2E film body, Tamzooka (150-600), Tamron 90mm/2.8 VC (ver 2), Tamron 18-270 VC, Canon FD 100 f/4.0 macro, Canon 24-105 f/4L,Canon EF 200 f/2.8LII, Canon 85 f/1.8, Tamron Adaptall 2 90mmf/2.5 Macro, Tokina 11-16, Canon EX-430 flash, Vivitar DF-383 flash, Astro-Tech AT6RC and Celestron NexStar 102 GT telescopes, various other semi-crappy manual lenses and stuff.

  
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R2duBot
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Dec 08, 2012 10:15 |  #1217

archer1960 wrote in post #15341382 (external link)
That is an accurate description of guiding, though they're not necessarily as expensive as you appear to think. I guide with an $80 finderscope, $90 (IIRC) webcam and free software on my cheap laptop. Of course you can spend much more if you want, just like you can for your tracking mount.

Nice job with your non-guided tracking; that's a great shot!

Thanks! I guess it's not that expensive, but that's also relative. For me I would have to upgrade my motors, as the True Tracks system doesn't work with autoguiders. (That's coming from an Orion CS rep.) I found a hack online to mod the systems together, maybe someday I'll try it.


_______________
6D -- 7D -- Canon 16-35mm f/2.8L II -- Canon 50mm f/1.4 -- Σ 70-200mm f/2.8 OS -- Canon 400mm f/5.6L -- 430EX II -- Orion Skyview Pro w/True Track

  
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spoonofmilk
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Dec 10, 2012 05:52 |  #1218

IMAGE: http://farm9.staticflickr.com/8212/8257690912_cd382f373d_z.jpg
IMAGE LINK: http://www.flickr.com …s/spoonofmilk/8​257690912/  (external link)

My first shot of Jupiter's moons - I obviously admit to overlaying a better exposed shot of Jupiter, so it's not just a bright blob though. Still not managed to get a nice shot of Jupiter itself yet.

Some photography gear no-one really cares about!
website (external link)| flickr (external link)

  
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mikeCL
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Dec 13, 2012 17:43 |  #1219

Nice job!




  
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04yellowf150
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Dec 14, 2012 02:27 |  #1220

I was out taking images of the meteor shower and got bored so here is 50 stacked images of M42 at 250mm with 1m 54sec worth of exposure with a hint of the running man. I used iso 12800 and 6400, that explains the grainy image lol. Standard photography tripod also. Time to bring out the scope :)

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ama168
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Dec 15, 2012 09:13 |  #1221

My try at Pleiades. I still have a lot of learning to do...
35mm 28 lights ISO 200 6 sec. 3dark 3bias

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04yellowf150
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Dec 24, 2012 09:17 |  #1222

Flame Nebula- This was taken with a standard camera tripod.

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archer1960
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Dec 24, 2012 09:19 |  #1223

04yellowf150 wrote in post #15402798 (external link)
Flame Nebula- This was taken with a standard camera tripod.
QUOTED IMAGE

You used your 55-250 for this? That's amazing. What were your sub-exposure times?


Gripped 7D, gripped, full-spectrum modfied T1i (500D), SX50HS, A2E film body, Tamzooka (150-600), Tamron 90mm/2.8 VC (ver 2), Tamron 18-270 VC, Canon FD 100 f/4.0 macro, Canon 24-105 f/4L,Canon EF 200 f/2.8LII, Canon 85 f/1.8, Tamron Adaptall 2 90mmf/2.5 Macro, Tokina 11-16, Canon EX-430 flash, Vivitar DF-383 flash, Astro-Tech AT6RC and Celestron NexStar 102 GT telescopes, various other semi-crappy manual lenses and stuff.

  
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04yellowf150
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Dec 24, 2012 10:22 |  #1224

archer1960 wrote in post #15402804 (external link)
You used your 55-250 for this? That's amazing. What were your sub-exposure times?

The majority of them was 2 seconds then I went down to 1"6. Iso also varied between 12800 and 6400. I had to use the high iso due to the limited exposure time. With it being at 250mm I had to go out and realign the camera and hope for the best lol. I also had 20 dark frames.


Chad- C & A Photography
Gripped Canon t2i | Canon 580EX ll Flash | 18-55mm IS | 55-250mm IS | 50mm f/1.8 | Tamron 70-300mm | Tokina 11-16mm f/2.8 | Celestron EdgeHD 8inch CGEM | Orion SSAG/80mm ST| BackyardEOS

  
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SimonClarkson
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Dec 25, 2012 13:41 |  #1225

Here are my very first attempts at shooting the night sky!...

I struggle with getting a dark sky where I live however Iam going to North West Scotland in Feb!

Canon 5d MKII with 17-40mm Lens..

IMAGE NOT FOUND
IMAGE IS A REDIRECT OR MISSING!
HTTP response: NOT FOUND | MIME changed to 'image/gif' | Redirected to error image by FLICKR

Night sky 1st attempt (external link) by imagesliveon (external link), on Flickr

IMAGE NOT FOUND
IMAGE IS A REDIRECT OR MISSING!
HTTP response: NOT FOUND | MIME changed to 'image/gif' | Redirected to error image by FLICKR

Kenley Night Time Sky (external link) by imagesliveon (external link), on Flickr

ANY feedback would be fantastic!

Kind Regards



  
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dandai
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Dec 26, 2012 08:40 as a reply to  @ SimonClarkson's post |  #1226

SimonClarkson,both are nice,really like the first one.
Are these single exposures or stacks?
Looks like there may be a meteorite in the first one also.




  
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JimmyJam
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Dec 26, 2012 11:48 |  #1227

@Simon - Both are very nice. Is the difference in sky hue merely because of time of day difference, or did you post-process them differently?


Canon: 6D:D, 50D, [17-40mm f/4L],[28mm f/2.8],[24-105mm f/4L],[35mm f/2.0],[50mm f/1.8 II],[70-200mm f/4L],[80-200mm f/2.8L MDP],[85mm f/1.8],[100mm f2.8 Macro],[100-400 f/4.5-5.6L]

  
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Jim ­ Shaffer
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Dec 26, 2012 13:35 |  #1228

On a whim, I decided to throw a bunch of my non-meteor-containing shots from my Geminid attempt into Deep Sky Stacker, knowing that the results would probably be terrible due to only having JPEGs. I was surprised to find that I had captured a fairly elusive object, the California Nebula.

The original shots were taken with a 17-40mm f/4 at 17mm, 30 seconds each at ISO 1600. This excerpt from the stack was highly cropped and then resized to 1024 pixels wide. I've also included a crop from an unprocessed original. The open cluster at top left is the Mirfak Association, the one at right is of course the Pleiades.


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Madweasel
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Dec 26, 2012 15:41 |  #1229

It is surprising (to beginners in the area like me) what can be drawn out by stacking. Even two frames are considerably better than one.


Mark.

  
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SimonClarkson
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Dec 26, 2012 17:10 |  #1230

dandai wrote in post #15408351 (external link)
SimonClarkson,both are nice,really like the first one.
Are these single exposures or stacks?
Looks like there may be a meteorite in the first one also.


Thanks,

There are Both Single Images. I don't know how to stack photos yet. :(

Kind Regards




  
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You don't need a telescope
FORUMS Photo Sharing & Visual Enjoyment Astronomy & Celestial 
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