[ ESO ] La Silla


SofI - Instrument overview

General description

SOFI is the infrared spectrograph and imaging camera on the NTT. The optical layout can be viewed in Figures 1 and 2.
The instrument offers the following observing modes:

imaging with plate scales of 0.144, 0.273 and 0.288 arc-seconds/pixel using broad and narrow band filters in the wavelength range 0.9 to 2.5 microns. Click here to check the image quality in the different configurations.
low resolution (R=600) and medium resolution (R=1200-1500), 0.93-2.54 micron spectroscopy with fixed width slits of 0.6, 1 and 2 arc seconds.
0.9-2.5 micron imaging polarimetry (postscript).

Array Characteristics

Array Format Hawaii HgCdTe 1024x1024 
Pixel Size 18.5 µ 
Q.E. 65% 
Gain  ~ 5.4 e/ADU 
RON  ~ 2.1 ADU 
Bad Pixels  About 10000
Non-Linearity  < 1.5% over 0 to 10000 ADU 
Dark Current  < 0.1 e/s 

Send comments to: ls-sofi <ls-sofi[@]eso.org>
Last Update: Dec 15, 2004, V.D. Ivanov