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Old 20-12-2007, 09:06 PM
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acropolite (Phil)
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acropolite is offline
Join Date: Feb 2005
Location: Launceston Tasmania
Posts: 8,988
Light wise, F9 is identical on both lenses, otherwise your exposures would be all over the place. An image with two different size lenses @ say f8 will have identical exposure (i.e. same amount of light) at a nominated shutter speed, only the FOV and DOF will differ.
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