Instrumental parameters
1K x 1K chip - limited by existing spectrograph
Focus 3-4 pixels fwhm over chip
few hundred spectral resolution elements
R resolution desirable for z-survey, imperative for Dn-s
Coverage 3900A-7500A desired - z=0 H,K to z=0.1 Ha.
=> require 2 grating setups per field.
3 x 20min 600V 4000A-5600A @ 5-6A fwhm
3 x 10min 316R 5400A-8400A @ 9-12A fwhm
40 mins overhead between fields (changing field plate, flats and arcs, slewing, acquisition)