On Mar, 21 apr 1998 11:51, Peter Leyssens <mailto:Peter.Leyssens@xxxxxxxxx>
wrote:
>Two remarks :
>1) I can use my 50mm to measure the light because the pinhole is about
>50mm away from the film plane. *Very* handy, this one.
>2) I know the Schwartschild reprocity failure, so I exposed my first
>roll of HP5 with 3 times the exposure that I calculated. This turned
>out to be overexposed by, I estimate, 1 or 2 stops. I think HP5 is
>rather imune to reciprocity failure. Now I'm exposing at exactly the
>times I calculate and we'll see what we get.
>
This fact (HP5 long exposures behaviour) was already pointed at on this
list. In fact HP5 is the fastest b&w film available for longest exposures.
Elite 100 is the fastest among the slides, if I remember well.
I wonder how did you calculate the aperture of the pinhole ?
Marco
mailto:tom@xxxxxxxxxxxx
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