[Last Change: 01 Mar 2011 (rev 2)]

Focus Position


The most recent plate focus tests indicate that the position of best-focus has not changed due to out-gassing of the optical bench. The nominal focus positions below (in motor steps) are taken from the Off-line Database (ODB).

Detector Nominal Focus Nominal Focus Nominal Focus Date Updated
  (motor steps from mechanism's zero point) (mm from zero point) (mm from launch-lock position)  
ACIS-I -536 -0.782 -1.038 8/25/99
ACIS-S -468 -0.684 -0.940 8/21/99
HRC-I -716 -1.040 -1.296 9/6/99
HRC-S -991 -1.430 -1.685 10/1/99


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