What’s this “Star Spectroscope” that we refer to above?
The Star Spectroscope is an older 200 line/mm grating designed primarily for visual use.
A beautiful 36 x 24″ laminated version of this poster is available for .95: link.
And you need to know how to mount it on your equipment. There are several ways to mount a Star Analyser grating.
In addition to watching the video at the top of this page, please take a look at this easy, one-page guide: “Choosing a Star Analyser Grating” Have questions? Use the green chat window in the bottom corner of your screen. Also, please read and use our calculator page: link. Our SA-100 grating has grooves that are spaced at 100 lines/mm.
This is due to various optical limitations as described in this technical paper by Doug West: link.
Note, however, that there are some situations where a 200 line/mm grating may better serve your needs.
And, because the SA200 spreads out the spectrum twice as much as the SA100, it can be mounted more closely to the CCD sensor.
As we suggested above, use our calculator page to determine whether the SA-100 or SA-200 is right for you: Calculator link.
For example, when mounting the SA-100 inside a filter wheel, space may be restricted.
Or, your filter wheel may position the SA100 so that it’s too close to the CCD sensor for it to create a long enough spectrum.
For specific applications where a 200 line/mm grating is necessary, we offer the Star Analyser 200. In some cases, adding one or two of our 10 mm spacers () may produce spectra with a bit more resolution.
If you mount a grating too close to your camera, you lose resolution.
Over the years, amateurs have used the Star Spectroscope and gotten good results.