I have an upcomming trip to the slot canyons in Arizona planned in November. I e xpect some pretty long exposure times (1-3+ min) will be necessary with my lense s at f16-22. I am concerned about reciprocity failure, proper color rendition, and grain in my final product. I will use both chrome and print films, with the goal a large print for my wall. And, yes, I will mostly be shooting 4X5, but a lso possibly 6X6 and 35mm if films unavailable in 4X5. As of this time, I am co nsidering Portra 100T with a 85B filter for this task. Any and all suggestions w ill be appreciated, but I am particularly interested in hearing from those of yo u who have actually shot these natural wonders, especially if you can give me po inters and/or what mistakes to avoid. Thanks to all in advance. Jeff
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