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Gary,
You may get away with a
little more time guiding on the stars since the comet is far
from "star like". Its light is spread out more on film due to its
coma, especially when using slide film (i.e. halation). It is my belief
this factor will give you a little more time to work with. How much I
don't know. I would just experiment since film is cheap. If the
weather is good here, I'm going to try a 30 second and minute longer exposure
with my FSQ-106. In addition, I'll probably try an addition one and two
minute exposure with my 165 mm.
Good luck with the
comet,
Wade
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