Re: READ THIS ONE- Studio Photography

I would think that from the original question, that the user was using
his studio strobes on light stands. He did mention that they were
Speedatron Brownline. For the member with the one pop per stop to get
his exposure right (considering the laws of physics) he would have to
move his light in a considerable distance for each exposure. The fall
off of light works on the same principle as f stops. If his lights were
at 11 feet and he moved them to 8 feet he would gain one stop. If he
then moved them to 5.6 feet he would gain another stop. Going along
these lines if he started his exposure at 11 feet and only used 6
flashes but moved then in one stop worth of light each time, his last
distance would be 1.4 feet. I don't doubt he gets acceptable results but
this is a lot of moving around in the dark.

memo marciano wrote:

> To the couple of members that raised the original
> question: the laws of physics state that the numbers
> of "pops" of flash needed is equal to 2 multiplied by
> itself as many times as stops separate the initial and
> final apertures. For initial f/45 and final f/128,
> there are 3 stops of separation, therefore the number
> of "pops" would be 2x2x2 = 8
> The above is valid when the flash is fired from the
> same position and angle. If the multiple firings of
> the flash is from different positions, the above
> approach is not valid. Now that I think, this could be
> the case for the member using the 1 pop per stop
> approach, in which case the flash position "KEY" is
> the one that we should be taking into account
> (mainly).

--
Chris Peregoy | http://www.gl.umbc.edu/~peregoy | http://imda.umbc.edu/