Henrik Dahl wrote:
>Got an Omnibounce for the T-32. It slips nicely into the filter holder.
>Neat little thing. So far so good.
>But I need a little help with the math here. The "manual" says:
>
>"There are no adjustments other than the manufactures indicated maximum
>distance being reduced by a factor of 2.5. The automation of your
>camera and the pre-flash will determine that you have proper exposure."
>
>My question is: 2.5 of what? Feet? Meters? F-stop? Or should I divide
>the distance with 2.5? But at 100ASA, f8 that would reduce the distance
>from 4 to 1.6 meters (Auto mode) Quite a giveaway...
>
Well, that's the way it is folks...... To quote from the Sto-Fen site.
"The only thing that happens with the Omni in place is the Maximum
Distance of the flash is reduced by a factor of 2.5. For example if your
Max Distance is 50 feet divided by 2.5 now equals 20 feet with the Omni
in place."
That's really the only way it can be. If you take the same total amount
of light and spread it out over a really much larger area, the average
brightness of any area drops considerably. Reflectors like their Two-Way
Bounce and many others, will not soften and cover everything out to
super super-wide, but may decrease the working distance less. Their site
has a FAQ and info pages <http://www.stofen.com/>.
>I mostly shoot TTL, does this 2.5 factor matter in TTL auto? (OM-4T and 2N)
>
TTL OTF will correctly expose with the Omnibounce with no adjustment,
but only out to the shorter distance.
Moose
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