When ever I head out to a sunrise shoot I always get there atleast 45mins and on setting up I will start shooting, even when there is very little light. Not even enough for my light meter to give me a reading. So I guess the exposure and after so many years of doing it I get pretty dam close as you can see.
With velvia 50 film you have to factor in reciprocity failure of the film and an exposure like this can start around 10 minutes and ends up being 6 to 7 minutes as you have to factor in the light increasing during the exposure.
On this day I was running a two private photo course for an underwater photographer who was having difficulty getting his exposures right on land with his own panoramic set up.
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