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FORUMS Photography Talk by Genre Astronomy & Celestial Talk 
Thread started 03 Jun 2016 (Friday) 23:59
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strider42
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Jun 03, 2016 23:59 |  #1

Hi guys, I'm quite new to astrophotography so please bear with me if this is a dumb question : )

I just saw an exceptional shot of the milky way the other day and couldn't believe how clear it was, so I contacted the photographer and he said he'd used one of these devices. But this was a shot just of the milky way alone.

My question is, can this be used to take landscape pictures somehow? I suppose that because it moves the camera to follow the stars, it would be enough motion to blur the landscape as a result. But maybe in post processing?

I'm having a hard time figuring how search terms to look, so if anyone can point me to any tutorials on doing this or explain it to me, I"d be very grateful, thanks!




  
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TCampbell
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Jun 04, 2016 11:50 |  #2

The ground will blur. Here's an example:


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This is is an 8 minute exposure of the Orion region shot from inside Science City on Haleakala (Maui, Hawaii).

Though the stars are sharp, you can clearly see the observatory in the foreground is not. This was just a test exposure as I was checking alignment so I didn't care about the foreground (and the lens is stopped down to take a longer image).

If you want the foreground, you'd probably want to shoot a still (non-tracking) image of that separately and just let the stars make trails, then shoot a tracked image of the sky. Then you'd probably just need to mask and merge the two images so you get a steady foreground with a steady sky.



  
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Celestron
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Jun 04, 2016 15:57 |  #3

TC you from Hawaii ?




  
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TCampbell
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Jun 05, 2016 12:38 |  #4

Celestron wrote in post #18029159 (external link)
TC you from Hawaii ?

No, but a club member (who lives here in Michigan near me) owns a place on Maui and he and his wife spend their winters roughing it on Maui. He invited me out for a week. He belongs to a couple of astronomy clubs in Hawaii, one of which is the Haleakala club and their observing site is inside Science City.

I will say that the images come out of the camera looking like they almost need no processing at all. At home, we have to do a lot of processing to deal with light pollution and enhance the details. But out there the skies are so dark that you don't really need to do much... what are normally "faint fuzzies" for us come out with very nice contrast for them.

Here's a single untouched frame out of the camera. I did shoot this as RAW using my 60Da (so the reds for Ha are much more prominent then they would be in an unmodified camera) and I resized this to be 1024 pixels along the longest edge and converted it to JPEG (to make it forum-friendly) but otherwise have not touched the image in any way. This literally is the contrast that comes straight out the camera -- this isn't even a "stretched" image.

I could get spoiled doing astrophotography from a place like this. I'd never get anything close to this imaging near home.

(I did take some longer images as well as some shorter images so I could HDR the M42 region -- this is just a single frame. I still need to shoot some even shorter images of the M42 region to add to the data... that'll be a job for next winter.)


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Celestron
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Jun 05, 2016 14:04 as a reply to  @ TCampbell's post |  #5

WOWY WOWY WOWY !! How long was exposure for this ? That's more BC than I ever got with stacked images !!




  
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TCampbell
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Jun 05, 2016 15:36 |  #6

Celestron wrote in post #18030078 (external link)
WOWY WOWY WOWY !! How long was exposure for this ? That's more BC than I ever got with stacked images !!

That's 1 minute at f/2 (Canon EF 135mm f/2L USM lens on the 60Da)

I just noticed that the website's EXIF simply reports it as "bulb" but my computer shows it was in bulb shooting mode, but the actual exposure duration was 64 seconds.




  
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FORUMS Photography Talk by Genre Astronomy & Celestial Talk 
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