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
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:
and apply some post-processing to achieve this:
These and other images are available for your perusal at the PATON HAWKSLEY EDUCATION LTD