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WHAT AM I MISSING ? GUIDE # FOR D200 FLASH

briantilley

Paignton, UK
30235 posts

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"RE: WHAT AM I MISSING ? GUIDE # FOR D200 FLASH"

briantilley Gold Member Deep knowledge of bodies and lens; high level photography skills Donor Ribbon awarded for his support to the Fundraising Campaign 2014 Nikonian since 26th Jan 2003
Sat 11-Aug-12 05:02 PM

>Actually yes.

That's good

>My intitial misunderstanding was the way Nikon expressed the
>guide number rating of the pop up flash.

It's not just Nikon - everyone (that I know of) uses the same convention.

>However, another question comes up from the posts...
>
>With two stops of difference in the exposure is not a flash
>with a quide number of 160, 4 times as powerful as a flash
>with a guide number of 80 ?

That is correct. What you read (about GN 160 being 2x the power of GN 80) was wrong. Perhaps the confusion arises because doubling the GN doubles the effective distance, but increases the power by 4x. In my view, GN's are a means to an end - they allow you to work out how far away your subject can be for a given aperture and ISO.

Brian
Welsh Nikonian

A general, generic topic WHAT AM I MISSING ? GUIDE # FOR D200 FLASH [View all] , largebore Silver Member , Fri 10-Aug-12 12:53 PM
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