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Old 25-01-2006, 03:15 PM
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avandonk
avandonk

avandonk is offline
 
Join Date: Aug 2005
Location: Melbourne
Posts: 4,786
You are only after H alpha so it might be worthwhile using a UV/IR blocking filter. Otherwise you only end up recording the heat from your feverish brow as you peer down the optic. Only joking!
Any UV present (light pollution from Hg/Na lamps)will also drown out a weak blue signal from a reflection nebula such as the running man.

Bert
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