CH Wrote:
>>
I remember the T20 also specified power output which is 50Ws.
<<
The T32 is close to 71 Joules (W-s) but the T20 is much lower, 25J (W-s)
based on some old notes I made.
The T45 is double the T32 at 142J (W-s). Note the GN of the T45 is 40% more
than the T32 as expected from the inverse square law.(Double power gets you
sqrt(2) more GN.)
Remember the T20 only covers an angle suitable for f=35mm lens, not 24mm as
does the T32/45.
An interesting GN comparison for portable flashes is the Metz 60ct potato
masher with large external battery pack. For the same angle of coverage as
the T45 (24mm lens) the GN *in ft* of the CT60 would only be 158, barely more
than the 147 of the T45.
Regards,
Tim Hughes
>>Hi100@xxxxxxx<<
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