Ah - I see the error: should be "subject and backdrop *are* evenly
illuminated". :-)
Could be if you're shooting Caucasians the +1 skin values are affecting
the head and shoulders shot. Try a medium grey person. If you don't
have one, feed someone Vegemite.
:-)
Andrew
On Jan 5, 2009, at 16:49, Andrew Fildes wrote:
> No - I expect the light to drop off if I move the softbox back (in
> fact, I rely on it) but what I was talking about is that if I move
> the camera position back from head and shoulders to full length, for
> instance, there seems to be a drop off, even if the subject and
> backdrop is evenly illuminated. It's not something I'll lose sleep
> over as I recheck the histogram anyway and I'm not enough of a geek
> to start rigorously testing it so it's merely anecdotal experience.
> It just puzzled me a bit.
> Hot spots? I'm properly baffled I'll have you know!
> Andrew Fildes
> afildes@xxxxxxxxxxxxx
>
>
>
> On 05/01/2009, at 10:39 PM, Wayne Harridge wrote:
>
>>>
>>> Answer the bloody question Dr Wayne -
>>>
>>
>> As for your softbox example I'd guess that the light is not evenly
>> distributed across the surface (it probably has a hot spot near the
>> centre)
>> which is probably why the intensity drops off more than you expect
>> when you
>> move the softbox away from the subject.
>>
>> ...Wayne
>>
>>
>>
>
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