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Hale-Bopp exposure times

  • From: P3D John Ohrt <johrt@xxxxxxx>
  • Subject: Hale-Bopp exposure times
  • Date: Fri, 21 Mar 1997 12:24:46 -0500
Advise from the net.

Max exposure with a fixed Camera and Lens

                         Declination (degrees)
Focal Length       0      30      45     60     75
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
28mm              35      40      50     75    140
50mm              20      23      28     40     75
135mm              7.5     8.5    11     15     30
200mm              5       5.5     7     10     20
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
This assumes 400 asa film, derate as required.  Best results may come at
shorter times if in a light polluted area or a full or gibbous moon is
up (like this weekend!)

At these times stars will trail noticeably.  The rule of thumb for stars
to still appear round is 5 seconds max exposure time at 50 mm fl, derate
linearly with fl.

Please not these are suggestions not guarantees!

Clear skies,
John
--
John Ohrt,  Regina, SK, Canada
johrt@xxxxxxx



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