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I found that 1600 was good in summer, and 3200 on nights of sub
5 degrees in winter. you can reduce noise with long subs by using a
mains powered adaptor in place of the camera's battery. Batteries build up a fair bit of heat over a session. Its amazing what people can do unguided.You can do several hundred subs and short exposures of 30-45 secs. Cometcatcher [Kevin] often works that way.
raymo
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