The SX Spectrograph is only 125 x 140 x 75 mm and weighs just over 1 Kg. It is solidly constructed in a machined alumi- nium enclosure and so will not flex during use. The optical design is based on a highly corrected, 550 groove concave re- flecting grating, that provides a spectral length of 31 mm from 340 to 900 nM. The entire spectrum is accessible by adjust- ing a sliding camera carrier, using a threaded drive screw, but most of the visible spectrum can be seen without adjustment, when using an TRIUS PRO-694 imaging camera. A 6 position slit wheel, with various slit widths and lengths, is provided and will al- low the sensitivity and resolution to be optimised for the user’s project. The resolution R factor when using the smallest slit width (20 microns) is approximately 2000.

• Self-collimating concave reflective grating spectrograph with a highly corrected flat field toroidal grating
• Minimal attenuation of near UV, due to mostly reflecting optics
• Built in guide camera
• Built in calibration lamp
• 550 grooves per mm at centre of grating
• Blaze Wavelength – 400nm
• Spectral Efficiency – Greater than 50%
• Useable Spectral Range – 340nm – 900nm
• Useful Grating Aperture – 26 x 26mm
• 6 position slit wheel – (20 uM x 1 mm Position 2 – 20 uM x 2 mm Position 3 – 50 uM x 2 mm Position 4 – 100 uM x 2 mm Position 5 – 300 uM x 2 mm Position 6 – 3mm x 3 mm circular)
• Female T2-thread (M42 x 0.75mm) input thread
• Male T2-thread (M42 x 0.75mm) output thread
• Input back focus distance – Approx. 37mm
• Output back focus distance – Approx. 17mm (adjustable from 10 – 20mm)
• Size 12 x 115 x 70mm
• Weight 1.2Kg