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Re: [OM] OT: G11 review [wasBefore you go, Moose ...]

Subject: Re: [OM] OT: G11 review [wasBefore you go, Moose ...]
From: Chuck Norcutt <chucknorcutt@xxxxxxxxxxxxxxxx>
Date: Fri, 18 Dec 2009 07:14:07 -0500
Sheesh!  Fire the flash, chimp the histogram, tweak the aperture. Done!

Dr. Flash



Piers Hemy wrote:
> Dr Flash must be occupied elsewhere, Mike, otherwise he would surely have
> clarified the GN for you.
> 
> If *my* memory serves if GN is 9 at ISO100, it should be approx. 50 at
> ISO3200. 
> 
> GN = f/stop * flash-to-subject distance
> 
> Thus for GN 9 at ISO100, use f/2 at 4.5m
> 
> Amend ISO to 3200, gain 5 stops, use f/11 at 4.5m
> 
> 11 * 4.5 = 49.5, being GN for ISO3200
> 
> But then, sqrt (3200/100) is greater than 5 but less than 6, thus
> 9*sqrt(3200/100) is likely to give the same answer ... if computed correctly
> :-)
> 
> Piers
>  
> 
> -----Original Message-----
> From: usher99@xxxxxxx [mailto:usher99@xxxxxxx] 
> Sent: 17 December 2009 18:02
> To: olympus@xxxxxxxxxxxxxxxxx
> Subject: [OM] OT: G11 review [wasBefore you go, Moose ...]
> 
> Welcome back, thanks for the few shots.  I wouldn' t have dared ISO 3200 on
> the G9.  Your shots  demonstarate well that high ISO turns a 
> baby flash into a fusion reactor equivalent at base ISO.   Let's see, 
> can't really find the GN for the G11????  I think the G9 is in the
> neighborhood of 9 ( m,ISO 100); so if memory serves that would be 9 *
> sqrt(3200/100)--approx 160!!!  
> 
> --ытшз
> 
-- 
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