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[OM] Re: Best Flash for the E-series

Subject: [OM] Re: Best Flash for the E-series
From: "Geilfuss Charles" <Charles.Geilfuss@xxxxxxxxxxxxxxxxx>
Date: Tue, 11 Oct 2005 11:42:39 -0500
        Thanks Mark. Obviously more complicated than I realized.

Charlie

-----Original Message-----
From: olympus-owner@xxxxxxxxxx [mailto:olympus-owner@xxxxxxxxxx]On
Behalf Of Mark Dapoz
Sent: Tuesday, October 11, 2005 11:53 AM
To: olympus@xxxxxxxxxx
Subject: [OM] Re: Best Flash for the E-series


On Tue, 11 Oct 2005, Geilfuss Charles wrote:
> 
> Mark,
>       Why wouldn't the FL-50 at least equal the T45 since the GN's are 50m
> and 45m respectively?

The GN measurements are calculated differently for each flash, you can't
compare them directly.

For the T-45: GN45 with an angle of coverage of 53deg horizontal, 74deg
              vertical (equivalent to an OM 24mm lens)

For the FL-50: GN28 with an angle of coverage of 78deg horizontal, 61deg
               vertical (equivalent to an E-system 12mm lens)

Since the FL-50 head has a built in zoom adapter, the GN50 is only achieved
at the tele end of 85mm.  If the T-45 had a zoom head to adapt it to this
angle of coverage then the GN would be significantly higher than 45.  After
using both flashes I'd say the T-45 is close to double the power of an FL-50.
Recycle time is also significantly faster on the T-45.
                                        -mark


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