RE: Creative Neg./Pos. Sandwiching techniques

["Jason Revell (in5)" <jason.revell@xxxxxxxxx>]

>Ken wrote:
>> I do believe this should be "underexpose" by one stop on each
exposure,
>>otherwise you would end up with final exposure 2 stops overexposed.>>
>>
>>Actually, this can result is some attractive images, but beware of
"overuse"
>
>No, I'm sure the article said overexpose.  Remember that the first
technique
>that I mentioned is using slide film.  Overexposure will make the slide
>lighter.  The resulting slide sandwich will be composed of two
overexposed
>slides, making the resulting sandwich close to a proper exposure, due
to the
>additional density each slide adds to the sandwich.  The
>article said the photographer's slide sandwiches were actually somewhat
>overexposed, but that this overexposure complemented the soft focus
feel.
>
>If you were using negative color film you would UNDEREXPOSE, the use of
slide
>film and its characteristics probably confused you?


There are , in my opinion, two ways of achieving the same results using
this
type of work ;

1/
Sandwich the slides together.  If this is done the slides will have to
be
OVEREXPOSE.  When the two slides are 'added' together their densities
will also be added, meaning each should be to light individually, but
of the correct density when added.  This is the way the article said I
believe.

2/
Make a double exposure.  If the image is made this way, (as on my EOS
10).
You need to UNDEREXPOSE the film, as the amount of light from each
exposure will be added together giving the 'normal' amount of light.

I have done double (often more) before with normal film but not EIR or
HIE,
it is certainly the easier of the two to do.  The problem with making
the two
slides is that you need to mount them exactly and make sure they are
secure and neither of them will slip.  Also on a cost point of view
surely
the double exposure method is half the price ! (presuming you get it
right!).

I hope this helps to clear things up a bit, but remember this applies
ONLY
to slide film as we are working with a positive.  If you want to use
NEG.
to sandwich underexpose for that method as well as for double exposure.

Jason Revell
jason.revell@xxxxxxxxx
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End of Infrared-Digest V0 #437
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