Quote Originally Posted by Les Sarile View Post
Now, if you were to look at the datasheets for some slide film - like Fuji Velvia 50 for example, it states to add +1 stop at up to 32 seconds which is well within the range of the control.
Are you sure about that? Velvia 50 used to start suffering from the reciprocity effect after 1 to 4 seconds, plus it required magenta filtration. This is one of the reasons I use Provia 100F - it has much better reciprocity characteristics. Has Velvia 50's forumulation changed in the last few years? Here's a shot with Velvia 50 that exemplifies its weak reciprocity characteristics.

St. Mary Falls, Glacier National Park, USA