A comment on this image I recently uploaded to the gallery had me thinking and I would like the opinions of those who are in to this sort of thing.... Background on the image: Over-cast day, tripod mounted, shot on Velvia, I would have used an aperture of f/16, and I believe the shutter speed was 2-3 seconds. **The comment made was**:*Yeah, typicaly Velvia, try next time a later time of the day so the sky is more blue, great shot. I like velvia and the Nikon n90* **My reply was**:*Well it was an over-cast day, so not a chance of getting "blue skies". I always shoot waterfalls on overcast days. Why? So I can use a long shutter speed there by attaining the smoothness of the water that I like, and assuring that highlights are not blown out nor detail lost in dark shadows...maybe a neutral density filter? While a blue sky certainly would have been a lovely addition, it wouldn't have yielded the results I was trying to attain with the water...do you see what I mean?* I received an IM suggesting I try ISO 25 film....which leads me to my question or rather my idea/feeling....ISO 25 is only a one stop difference from ISO 50.....I still don't feel that shooting with ISO 25 on a "blue skies" sunny day would yield satisfactory results.... Any opinions on this? I'd really like to know if my thinking is way off base.......

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