Imaging: Filters and Objectives

Filters



  Wheel 1      
   Wheel 2      
Pos.
Name Central wavelength (µm) Width (µm) Width(%) Plot
Name Central wavelength (µm)  Width (µm) Width (%) Plot

Open         
NB 2.28  2.280  0.030  1.4 Gif,ASCII

NB 2.19  2.195  0.03  1.37  Gif,ASCII
 NB CO  2.336  0.03  1.32  Gif,ASCII

NB 2.09  2.09  0.02  0.96  Gif,ASCII
F ocus wedge         

NB 1.19  1.187  0.01  0.84  Gif,ASCII
Open         

NB 1.06  1.061  0.01  0.94  Gif,ASCII
NB 1.08  1.083  0.0164  1.48  Gif,ASCII

Closed         
NB 1.21  1.215  0.018  1.5  Gif,ASCII

0.9  0.14  16   
NB Fe[II] J  1.257  0.019  1.48  Gif,ASCII

GBF  0.925  cut-on     
NBPbeta  1.282  0.019  1.5  Gif,ASCII

GRF  1.424  cut-on     
NB [FeII] H  1.644  0.025  1.52  Gif,ASCII
10 
Js  1.24  0.16  13  Gif,ASCII
NB 1.71  1.71  0.026  1.52  Gif,ASCII
11 
1.247  0.290  23  Gif,ASCII
Closed         
12 
1.653  0.297  18  Gif,ASCII
NB HeI K  2.059  0.028  1.36  Gif,ASCII
13 
Ks  2.162  0.275  13  Gif,ASCII
NB H2 S1  2.124  0.028  1.32  Gif,ASCII
14 
         
NB BrGamma  2.167  0.028  1.29  Gif,ASCII
15 
         
NB 2.25  2.248  0.03  1.3  Gif,ASCII
Table 1. SOFI filters.
Encapsulated Postscipt format
Figure 1. SOFI filters.

The solid (red) lines indicate the currently available broad-band JHKs filters. The short-dashed (magenta) lines are the available narrow-band filters. The long-dashed (red) lines show the soon to be commissioned Js filter (top panel) and the typical broad K filter (Persson et al. 1998 A.J. 116, 2475; Table 10). The dotted (blue) line is the atmospheric transmission model for Mauna Kea, for Am=1.0 and water vapor column of 1mm (Lord, S.D. 1992, NASA Technical Memor. 103957; courtesy of Gemini Observatory). The data for the plot and the SuperMongo script are available here.

Objectives

Name Field (arcmin)  Scale (arcsec/pixel) 
Large Field (LF) 4.9 x 4.9 0.288
Small Field (SF) 2.4 x 2.4  0.144 
LF + Focal Elong. (FE) 2.4 x 2.4  0.144 
Spectroscopic Objective (SO) 4.5 x 4.5  0.273 
High Resolution (HR)
(not offered)
1.2 x 1.2 0.072
Table 2. SOFI Imaging modes.

Image Quality

The image quality of the Large Field mode is checked regularly. You can retreive some information :

 
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