Telescope Focus 2010

This table gives the telescope focus for all WHT instruments used throughout 2010, as taken from the logbook. Click on the instrument name to view the TO page for that instrument.


INSTRUMENT FOCUS (Measured) FOCUS (Nominal) NOTES
ACAM

97.75 - 98.25

98.05 - 98.10

AF2

82.5 - 82.8

82.45 (compromise)

82.25 (WYFFOS detector and fiducial TV)
82.65 (outer field)
83.20 (mobile probe)

98.88

97.7 - 97.95

95.15 - 95.6

Focus needs to be checked with each filter

98.60

98.5

98.23 - 98.30

98.20

97.6? 97.7 - 97.95

97.83

98.04 - 98.25

98.10

98.60

98.35 - 98.53

It doesn't need to be perfect: the DM takes out small errors

86.55 - 87.2

PNS

97.45? 97.85 - 97.9

97.9

97.90 - 97.95

97.90 - 97.95

Focus with ACAM

95.45 - 95.50

98.35




Last modified: 02 June 2011 by Fiona Riddick