25 sec dark exposure, with the detector at LN2 temperature.
25 sec dark exposure, with the detector at LN2 temperature.
Pupil image. As can be seen, the wheel zero point of the filter, grism and
pupil wheels have been adjusted.
The image was made with a pinhole in the aperture wheel. This turns out to be
the preferred way to make flat fields, as flat fields looking into a room
temperature wall immediately saturates.
Pinhole image with the wide field camera. Focus position Z=0.
Image diameter = 68 pixels.
Pinhole image with the high resolution camera. Focus position Z=0.
Image diameter = 91 pixels. At Z=6150, diameter has only decreased
to 72 pixels. Note the symmetric illumination due to proper placement
of the pupil wheel.
Back to IJAF home
Last updated April 6, 2001 by norup@astro.ku.dk