Amazing Back-Garden Astronomical Pictures...

by Thomas
4 replies
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Have a look at these:

astropix.co.uk

They were taken on an 8-inch telescope in a garden shed!
  • Profile picture of the author Michael Mayo
    Thomas,
    They were great photos.

    Did you notice the exposure times at the bottom of each photo?

    Have a Great Day!
    Michael
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    • Profile picture of the author ThomM
      Originally Posted by Michael Mayo View Post

      Thomas,
      They were great photos.

      Did you notice the exposure times at the bottom of each photo?

      Have a Great Day!
      Michael
      I noticed them, just couldn't understand them:confused:
      "Sh2-115, in Cygnus, exposure time was 50mins in each Ha, RGB a total of 3hours 20mins"
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      • Profile picture of the author Thomas
        Originally Posted by Michael Mayo View Post

        Did you notice the exposure times at the bottom of each photo?
        Originally Posted by ThomM View Post

        I noticed them, just couldn't understand them:confused:
        "Sh2-115, in Cygnus, exposure time was 50mins in each Ha, RGB a total of 3hours 20mins"
        I did. Afaik, the longer the exposure time, the more light gathered... the more light gathered, the more detailed the image.

        In Thom's example: I dunno what the Ha is referring to but I'm guessing he (the astrophotographer) used red, green, and blue (RGB) filters to record seperate images and then combined them into one (in the same way that a computer monitor uses those colours to create a multitude of colours). As for the rest: since Cygnus is the constellation, I guess Sh2-115 is the name of phenomenon being photographed.

        Tommy.
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        • Profile picture of the author Thomas
          Originally Posted by Thomas View Post

          I dunno what the Ha is referring to...
          Now I do: Google tells me it's a hydrogen-alpha filter. Apparently, they are often used in astrophotography when imaging fast-moving phenomena. I guess it makes sense since Google also tells me Sh2-115 is a nebula and I gather they aren't exactly slow-moving by any stretch of the imagination.

          So there you go!
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