From: Larry Colen
On Sep 10, 2012, at 5:16 AM, P. J. Alling wrote:
I didn't think that guide numbers had any real meaning except when
using flash.
Neither did I. They probably don't, but most sites are still
listing the LED macro ring light as having a guide number of 18m.
They don't tell you anything other than how far away you can be for a
given f-stop or what f-stop you need to use at a given distance.
... if you can remember the formula & have a calculator handy.
Other than that, which gives more light; the one with a guide number of
18m or the one with a guide number of 60ft?
Doesn't really matter what kind light it is.
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