Well Kirk, the reciprocity characteristics is not that good - check the datasheet at Foma's website - basically, you have to adjust exposure starting at times of mere 1sec (add 1EV), at 10sec you have to add 3EV (expose for 80sec), and instead of 100sec exposure, you have to wait for 1600sec (like 27minutes) with the shutter open!!
But if your exposures are not limited by the time, if your composition and idea permits exposure for so long, the resulting negatives are nice and good to work with further...
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