http://www.chrisspages.co.uk/H-Power%20Project/ReasoningAndExperiments/exper iments.htm Look near the bottom of page or search for "spectrograph" Chris http://www.chrisspages.co.uk -----Original Message----- From: owner-photoforum@xxxxxxxxxxxxxxxxxx [mailto:owner-photoforum@xxxxxxxxxxxxxxxxxx] On Behalf Of ADavidhazy Sent: 07 April 2009 12:55 To: List for Photo/Imaging Educators - Professionals - Students Subject: Re: Spectrograph Chris, Congratulations on this project. It is something I was always interested in but never motivated enough to follow through. So it was good to hear of your success! (I could not find the spectroscope images on your page though) andy Chris wrote: > I wanted to make a spectrograph of ionised gas. I decided to put a hand > spectroscope on to my DSL camera. I bought one hand spectrograph but is was > square and was useless with the spectrum of to one side. So a bought another > and found this plastic one was just a toy and was useless even after I took > the eye lens off to fit on the camera. > I eventually found one also for school use that was the same diameter as a > microscope tube, made of metal, and would therefore fit my microscope > attachment. Then I found the eye lens would not come off so it had to be > fitted in front of the camera lens. I tried this by holding the combination > of spectroscope and microscope attachment in front of my 50 mm lens and > found that I got an image. > I then was able to buy a T2 to 46 mm filter attachment and using my existing > 46 mm to 58 mm filter adapter I fitted in front on the lens. > I mounted the camera on a tripod and pointed the apparatus at the ionised > gas in the glass tube and took a succession of emission spectrographs with > different exposures. The best one was 30 seconds. > I obtained a satisfactory spectrograph with the red hydrogen lines (split > into two by the physical process involved) and a succession of lines right > across the visual range. > The spectroscope that I used finally is labelled "diffraction grating > spectroscope TE313". I cannot recall the company I bought if from but I > found it as a result of a web search and bought it off the web by secure on > line order. > You can find the spectrographs I took on my web page (below) - look under > H-power project > experiments. > The camera was a Cannon EOS 450D with cannon 50 mm prime lens f 1.4 used at > full aperture. The microscope attachment was a Fuji ST 701. > Chris > > http://www.chrisspages.co.uk
