No no, I get that - I was wondering why you'd use ISO 1600 for 60 seconds instead of ISO 800 for 2 mins or ISO 400 for 4 mins. Perhaps because it's first light and you just wanted enough for a decent test...? I'd love to use lower ISOs and longer subs but I'm shooting unguided, so not an option.
Quote:
Originally Posted by traveller
That's a great effort Rod.
Chris, the reason behind the shot subs is because Eta is a very bright DSO (second only to M42), so shorter subs will help to prevent the core from being overexposed, esp when you are shooting at f4/f5.
Cheers
Bo
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