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so how the heck does all this equal out
Old 04-12-2004, 02:45 PM   #1 (permalink)
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sigma EF500 165'/50m @ 105mm
sunpak PZ40X 133'/40m @ 80mm
**** 54MZ-4 177'/54m @ 105mm
nikon SB-800 125'/38m @ 35mm

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Re: so how the heck does all this equal out
Old 04-12-2004, 03:07 PM   #2 (permalink)
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Uhh.. I understood that the job required NO MATH!


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Re: so how the heck does all this equal out
Old 04-12-2004, 03:38 PM   #3 (permalink)
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My guess is that you are trying to decide on which flash puts out more light.. I ran into this a while back and here's what I found using info on B&H's website..

Metz 54MZ4
131' (39.9 m) at 50mm
177' (54.0 m) at 105mm

Nikon SB-80
125' (38.1 m) at 35mm Position

The result is that there was no significant difference in output.. As you set the flash at a wider angle, the GN decreases since the light is not as concentrated..

You'll probably have to use multiple sources to get a clear answer but for what it's worth I feel it will come down to personal preferences.

I hope this helps..

Israel
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Re: so how the heck does all this equal out
Old 04-12-2004, 08:14 PM   #4 (permalink)
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yeah you hit the nail right...
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Re: so how the heck does all this equal out
Old 04-13-2004, 01:37 PM   #5 (permalink)
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Here ya go....all GNs in feet @ ISO 100 @ 50mm

Sigma EF500 - GN 132
Sunpak PZ40X - GN 102
Metz 54MZ-4 - GN 132
Nikon SB-800 - GN 138

Now....taking into accout the slight differences between manufacturers testing methods, and design differences in the concentrating lenses, they are remarkably close. Truth be told, there's only just so much capacitor power you can put in a shoe mount flash, and these figures aren't but about 1/3 stop different from a 20+ year old Vivitar 283 (GN 120).

Don't worry about the power, concentrate on ease of use, features and cost vs. reputation.

David
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Re: so how the heck does all this equal out
Old 04-13-2004, 01:46 PM   #6 (permalink)
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Thanks mate [img]/ubbthreads/images/graemlins/tongue.gif[/img]
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