I am surprised that no one has responded, yet. I'll be the duffer.

With a flash, a doubling of the distance from flash to subject is a 4 fold
reduction in illumination that's 2 stops. So in the same vein a doubling of
the bellows extension from say 150mm to 300mm would necessitate a 2 stop
increase or 4 fold increase of light requirement getting to the film..
Therefore a partial extension say 1/2 way would be 1 stop increase and so
on. Rough as guts but it is quick and gets you in the ball park (where ever
that is) to the nearest 1/2 stop. This does require one to mark by big fat
texta or neat biro on tape or mearly tape measure the increase in bellows
extension.

If you are new to macro, keep watch on the lighting so that the lens is not
so close to the product that it casts it's own shadow.



"MangroveRoot" wrote in message
news:KC32k.2583$Yw1.410@trndny02...
Max Perl wrote:
When you use a view camera for macro work you have long extention on the
bellows. You then need to compensate for the lost light to calculate a
proper exposure. Does somebody have an easy way to calculate the
exposure compensation?

I am using a 6x9 Linhof and want to play with a 5.6/100 Componon-S. I
guess you don't compensate down to 1m? ... but from here and closer?

Would I be right in the belief that this question, and the solutions to
it,
would be applicable to formats other than "large",
should one care to do such a thing?

(I do extremely little (haha) macro work, and my largest camera is a 645,
and while that and my old 35mm are pretty clunky, they still are advanced
w/r/t many large-format camera, correct? And, of course, my DSLR does
everything but procreate. So I doubt I will *need* to know this.
But it would be nice to know if it applies, and, if so, how to do it.)