Thread: a x b=
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Old 27-04-2016, 04:56 PM
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Regulus (Trevor)
Regulus - Couer de Leon

Regulus is offline 		 
Join Date: Nov 2011
Location: Devonport, Tasmania
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a x b=
Can someone give me (or point me to) the equation for determining the increase (decrease) in light gathering power between lens apertures.

Thanks - Trev
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