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Dear List Members, I’m back on the list after a short break. Here is a report of an experiment I have done. 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 |
