SPRAT on LT works from 4000 - 8000 Angstroms. This "one-octave" range is the most one
can get before order overlap in a non cross dispersed spectrograph.
A possible design option is to combine SHOC and SPRAT into one instrument. The following
describes some testing of this concept on the Liverpool Telescope (LT) version of SPRAT.
On the afternoon of 2017 12 17 the 85mm f/1.8 Nikon camera lens