Macro the 1/f rule and flash duration

Started Sep 8, 2008 | Discussions thread
John K Veteran Member • Posts: 7,611
Re: Mea Culpa

fred vachss wrote:

What I should try next is revisit my post on diffraction limits and
show what the flash duration is for 1:1 at f/16, 3:1 at f/8 and 5:1
at f/5.6 (at various ISOs). These are the values at which I observed
blurring that I contended was due to diffraction, but there was some
discussion as to whether some of this may have been motion blur due
to overlong flash duration. When I get the numbers maybe we can put
that discussion to rest at last.

Cool!

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