A high efficiency, low resolution grism spectrograph and focal reducer
(5:1). IGI uses the TK4
CCD
as a detector. On the 2.7-m in imaging mode it can reach mv = 22 mag in
3 minutes with a 7 arcminute field. In the spectroscopy mode it can reach
mv = 20 mag in 30 minutes and cover a wavelength range from 0.4 to 1.0
micron at a resolution of 12 - 20 Å. Multi-slit (up to 25 object) capability
is available.
IGI with TK4 gives a 3.5 to 1 reduction of the platescale at native cass, but
only covers a 48 mm x 48 mm field of view at the cass focus (roughly 7x7
arcmin on the 2.7-m at f/9). Only one filter can be used at once and they are located at the
telescope focus so can suffer from dust build up. It is designed primarily
as a fast spectrograph rather than an imager.
STAR-1
and PIXEL
CCD acquisition and guiding are available.