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PostPosted: Fri Oct 23, 2009 8:35 am 
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Hi folks,

If you are an astrophotographer have you ever thought of turning your hand to spectroscopy?

After following a link on a British Astronomical Association circular this morning I came across the STAR ANALYSER.
      Image
I have no experience with this product and I imagine that many other similar products exist out there on the Net if you look so this post is in no way intended as a personal endorsement. Spectroscopic gratings have been around forever but the pleasant surprise was how cheap they have become. The example above is comfortably below £100 ($167). Pair such a filter up with a 200mm f9 reflector and a Philips ToUcam Pro webcam and you can capture a spectrum of Vega, one of the brighter stars in the sky, thus:
    Image
and apply some post-processing to achieve this:
    Image
These and other images are available for your perusal at the PATON HAWKSLEY EDUCATION LTD website.

Bob.

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OM-D E-M5, H-PS14042E, Gitzo GT1541T, Arca-Swiss Z1 DP ball-head.
Astrophotography: TEC 140 'scope, FLI ML16803 camera, ASA DDM60 Pro mount.


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PostPosted: Fri Oct 23, 2009 8:42 am 
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Interesting, although I'd be interested in using one the other way - using it to measure the response of the camera sensor.

I have seen cheap diffraction grating films before e.g. here although for this DIY approach you'll need to work out the angle of deflection for a given line spacing to determine a suitable one allowing for sensor size and distance.

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