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Old 11-11-2009, 12:28 AM
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Tandum (Robin)
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Join Date: Apr 2008
Location: Wynnum West, Brisbane.
Posts: 4,166
I think that 70-300 canon lens is about F5.6 while your C8 is F10. I think that puts you 2 F stops away from the canon lens which means you need 4 times the exposure so 120 seconds not 30 to get to the canon lens.
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