> Dear OMer's,
> a periodic question that appears here is:
> What is the
> relationship between Flash GN and stored energy in the Flash
> capacitor? This
> depends on reflector efficiency, area of coverage and flash tube
> efficiency.
> Here is a comparison between the OM T20 and T32 flashes showing
> that despite
> the differences in flash tube,reflector and stored energy the overall
> efficiency is almost identical.
>
> T32 Flash energy 70 Joules (or Watt-secs) GN 32 (m)
> coverage 24mm
> Lens
> T20 Flash energy 25 Joules (or W-s) GN 20 (m)
> coverage
> 24mm Lens
Except that the T20 only gives coverage for a 35mm lens.
Chip Stratton
cstrat@xxxxxxxxx
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