NIRC/Guider Focus and Tilt Comparison
On 10 May 1998, Malign was run at various rotator position angles (ROTPPOSN) on both the NIRC detector and the guide camera. This provides a comparison of the focus and the secondary tilts between the two systems as a function of p.a.
From this, one could, for example, focus a star on the guider, offset the focus by the amount shown below, and provide a well-focused image to teh NIRC detector in situations in which one cannot focus directly on the NIRC detector. One such situation may be focusing at 3-5 microns, using the max12ur timing pattern. Note that elevation effects are not addressed here.
| NIRC | Guider | |||||
| ROTPPOSN | Focus | az tilt | el tilt | Focus | az tilt | el tilt |
|---|---|---|---|---|---|---|
| -180° | -0.053 | -1.674 | 1.062 | -0.170 | -21.730 | -5.289 |
| -150° | -0.052 | -1.063 | 1.632 | -0.183 | -18.960 | -14.598 |
| -120° | -0.044 | -1.264 | 0.721 | -0.190 | -5.558 | -18.590 |
| -90° | -0.050 | 0.355 | -1.205 | -0.165 | 0.045 | -19.213 |
| -60° | -0.050 | -1.234 | -2.387 | -0.129 | 10.816 | -18.553 |
| -30° | -0.040 | -0.020 | -1.673 | -0.083 | 19.139 | -9.359 |
| 0° | -0.026 | 0.676 | -0.510 | |||
| 30° | -0.015 | 0.287 | -0.695 | 0.009 | 15.968 | 13.443 |
| 60° | -0.014 | 4.440 | -1.558 | 0.009 | 6.385 | 19.353 |
| 90° | -0.001 | 2.172 | -1.473 | 0.009 | -6.371 | 18.423 |
| 120° | 0.005 | 0.254 | -1.857 | -0.039 | -10.333 | 14.819 |
| 150° | -0.002 | 1.444 | -3.184 | -0.087 | -16.879 | 10.138 |
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