Mark IV Test Images

[Tom Droege <droege@wwa.com>]

Michael,

Attached are a few Mark IV test images.  Could you put them up on the web
site for all to see?  Arne cannot read my attachments and complains that I
use up bandwidth to NOFS which has to carry bits up the mountain on a mule.

Description below.

Tom 
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Here are four little test images.  In all north is to the left and west is
at the top.  These were taken at 22:12 locate time in Chicago, 42N, 88W.
Just in case someone wants to identify the star fields.  ;^)  There were
thin clouds, so the sky background is quite high.  For the V images the
mean of a dark frame is -23737.  For the I images -23842.  Pixel scale is
roughly 7.7" per pixel.  The VCO rate is still not quite right.  I expect
that it accounts for several pixels of smear in the E-W direction.  

Exposure was about 100 seconds.  Vfield1 and Ifield1 are a pair through the
V and I filters, etc.. 

Looking at these images, I don't see anything left that I think is
vibration.  There is a shoulder on the images that might be due to "halo"
from the cloud cover.  Experts can comment.  I await a really clear night
to attempt a good focus and good VCO adjustment.  

Tom Droege

Ifield1.fts

Ifield2.fts

Vfield1.fts

Vfield2.fts