Subject: Re: GRIM II thermal backgrounds

From: Mark Hereld

Submitted: Sun, 9 Feb 1997 11:14:17 -0600 (CST)

Message number: 36 (previous: 35, next: 37 up: Index)

> our 3.4m aperture to 2.6m. The camera on the 2.2m had an optimized
> cold stop that blocks out the high emissivity central hole in the
> primary; I don't know if GRIM II does.

GRIM II does not.  Cold stop only blocks at outer edge of primary/secondary
image:  no rotating vanes or central obscuration in mask.

Interesting measurements all 'round, though.

- mh

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