DEIMOS Pre Ship Review

Readiness Review- August 2001

Optical Quality

•The camera is operating 20C above design temperature, and optical design predicts some coma at the edge of the field. The predicted length of tails is 9 px. We see 0 to 14 pixels from the middle to the edge of the field. The tails are present because the camera focal length is too long at room temperature, and Element 9 is not at the right place in the converging beam. This induces primarily radial coma that should go away at 0C.

•In the center of the field where coma is not a problem, we see aberrations that are expected by the optical design (<<2px rms dia).

•The bottom line on image quality is that the real test is at the outer part of the FOV, and we will not be able to say much until we get to HI at 0C.