As various people have said, going to the National Geographic site and
typing Pentax into the search engine produces a few hits, mostly from
people using 6x7's. I notice that the ones from the series 'Over the
Sonoran' have a lot with the legend:

Film Type: Fujichrome Provia 100 RDP II (push-processed two stops)

For example:
http://www.nationalgeographic.com/ngm/0010/feature2/zoom3.html

My question is why would the photographer want to push-process Provia 100
two stops? Why not just use Provia 400F ? Or am I missing something
obvious here? (very likely!)

Chris
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