[alt-photo] Re: Ultra Long Exposure Reciprocity Failure?

[sitgesn1 at aim.com]

Hi Francesco,

Some time ago I did a small work about film reciprocity for pinhole application for films
available during those days. Here it is:
http://personal.telefonica.terra.es/web/novau/CurvesReciprocity.htm
As you can see my math functions predict exposures between 0 and 1 hour and fit 
extremely well with experimental data

 

 

 

-Francesc
Fotografia estenopeica=el mon per un forat ...pero de cap per avall
http://personal.telefonica.terra.es/web/novau/