Subject: WRT Daniel Comments

From: Dave Monet

Submitted: Thu, 24 Apr 2003 10:50:58 -0700

Message number: 118 (previous: 117, next: 119 up: Index)

Daniel makes good points, but I am not ready to give up yet.

  1) During the recent astrometric and photometric calibration meeting,
     the importance of tying LSST into external standard systems was
     noted many times.  My point for a ND filter is that LSST occupies
     such a unique position in telescope/detector space that the
     Project (and not the community) needs to develop a road map for
     making sure that LSST is "on the system".  We did the 600
     pound gorilla thing with SDSS, and unless there are really good
     reasons for defining yet another photometric and astrometric
     system for LSST, transformations to existing systems are just
     as important as getting clear skies.

     My point was not so much as requiring an ND filter, but rather
     that the Proposal needs to address tying LSST into external
     astrometric and photometric systems.  We need to think about
     this, and to add pieces to the design if such are necessary.
     We can always remove these if other projects obviate them.

  2) CMOS is great for the dynamic range problem, but OTCCD would be
     much more useful if we needed to start guiding before the
     structure stopped shaking.  Maybe we will identify a sensor
     technology that tastes great and is less filling before
     we actually start cutting metal.

-Dave

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