SITe QE values ??

[a.walker x305]

John,

SITE are now offering CCD's with "Std AR" and "UV AR"
coatings.  The is a slight price premium for the UV coating.
I have no experience of the latter, but someone to do
with the Sloan survey might since their array has UV-AR
thinned, Std-AR thinned, and frontside CCDs.

The room temperature SITE figures I have seen are, together
with measured (-105C) figures at CTIO for a Std AR coating
(or at least the coating they were putting on 2-3 years ago)
are as follows:

        UV    Std       CTIO Std

3000    55     8           20
4000    70     60          60
5000    70     75          75
6000    70     82          77
7000    67     85          78
8000    60     75          65
9000    40     50          40
10000   15     20           3

Alistair Walker