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.
Originally Posted by Les Sarile
St. Mary Falls, Glacier National Park, USA