SBIG Spectrograph Review

Contribution: Dale Mais

In 1999, Santa Barbara Instrument Group (SBIG) released a novel product, a spectrometer, into the amateur market place.

Click on picture for a larger version.

The spectrometer is designed to operate with the ST-7/8. The object that is to be analyzed is viewed on the tracking CCD, simultaneously with the slit. The slit is backlit by an LED during setup to render it clearly visible on the tracking CCD.
The object is manually maneuvered onto the slit using the telescope controls, and is held there using SELF GUIDING during a long exposure. The spectra is recorded by the imaging CCD, oriented long-ways so the spectra falls across 765 pixels, with a height of about 16 pixels for stellar sources.
Two gratings and two slits are available for maximum versatility.

Features of the SBIG Self-Guiding Spectrometer:

Object analysed is viewed on tracking CCD simultaneously with slit (back illuminated)
Object is held on slit by self-guiding feature, slit = 18 microns
Spectra recorded on imaging CCD
Two gratings: 150 lines/mm <=> 4.3 A/pixel
  600 lines/mm <=> 1.07 A/pixel
Wavelength range: ~3800-7500 A (range in my experience 3600-10000A)
  ~3200 A coverage in lo-resolution mode
  ~750 A coverage in hi-resolution mode
Input window on bottom of unit for introducing calibration standards

Spectrometer attached to rear of C-14 via flip mirror

Several modifications to the spectrometer have been made which makes operation more convenient:

Gas discharge tubes with fiber optic leads to spectrometer

See also the SBIG spectrograph review & test by Olivier Garde!

If you are interested in spectroscopy join the SBIG spectrometer user group.