Did it again. There is NO 1/2 power on a T32. Time for dinner. :-)
Chuck Norcutt
On 9/29/2010 6:20 PM, Chuck Norcutt wrote:
> Sorry. That should have said "At ISO 100 I got exposures of f/5 for 1/4
> power and f/10 for full power." There is 1/2 power on a T32.
>
> Chuck Norcutt
>
>
> On 9/29/2010 6:15 PM, Chuck Norcutt wrote:
>> Just because I'm curious I did a test with two T32s firing
>> simultaneously into opposite sides of my office and aimed approximately
>> at the intersections of ceiling and walls. The room is about 10x13 feet
>> (approx 3x4 meters) with a white ceiling and light beige walls. Some
>> light can escape through a large window on one end but the window is
>> covered by a sheer, white curtain which probably reflects half of the
>> light. No photos taken but after bouncing off the ceiling and walls I'm
>> sure the light level must have been pretty even throughout the room.
>>
>> I tried both flashes set at 1/4 power (1/2 guide number) and full power.
>> At ISO 100 I got exposures of f/5 for 1/4 power and f/10 for 1/2 power.
>>
>> Your exact exposures will clearly be different because your room and
>> diffusers will be different but I was surprised. As you can tell from
>> my previous posts I was expecting that two flashes in a small area might
>> produce so much light that the major difficulty would be in controlling
>> the power of the flash somehow. Now I don't think that will be a
>> problem at all. If fact, you are likely to need to use the flashes at
>> full power. But controlling the exposure should be a simple matter of
>> using the aperture and or perhaps twisting the ISO dial a bit but
>> probably not over 200.
>>
>> This is good news and means you're very unlikely to have to resort to
>> filters or ingenious tricks. Good luck
>>
>> Chuck Norcutt
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