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ccs_hello
Carpal Tunnel
Reged: 07/03/04
Posts: 2805
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Re: Summary--VideoCAM Use on Non-guiding Mounts
07/31/08 08:50 PM
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Roland,
Here is my calculation based on worst case scenario:
Assuming a 10" f/10 SCT without focal reducer is used.
fl = 2500 mm
A type-1/2" CCD is used
Based on the above parameters, the TFoV will be
8.9' * 6.6' which is 534" * 396"
For a 2.1 second sense-up (128X), assuming an object near celestral equator is targeted, without moving the OTA,
2.1 second would cover 31.5 arc-sec trail.
Assuming CCD is mounted its narrow-side parallel to the star trail, the trail coverage will be:
31.5/396 = 7.95%
I.e., if a single star is framed and shown in the screen, it will be dragged 7.95% vertically in the screen.
P.S. the calculation does not count the field rotation.
(Note: shooting objects near celestral equator won't show field rotaion  )
Clear Skies!
ccs_hello
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