Handbook for the SX remote control Spectrograph Issue 1, 17/8/20
The spectrograph also includes a spectral line source for calibration. This source uses a small gas discharge bulb, which is
filled with a mixture of neon and argon. The result is an array of spectral lines that covers the entire visible spectrum and
which provides a way to determine the wavelengths of the lines from any external source.
A typical calibration spectrum, imaged with an M25C colour camera.
A spectrum with wavelength markers is provided in the appendix.
The optical input to the spectrograph is via a T2 female ring adaptor. There is also a 48 mm female ring option, available on
request. The back focal distance from the slit to the front of the T2 ring is approximately 40 mm mechanical (37 mm opti-
cal) and the clear aperture is 11 mm.
The camera is attached via the male T2 thread on the output adaptor, as shown below:
