Forget about the slow film and the long exposures, believing you'll get to stop down and get all that "sharpness". That's baloney Use whatever 100 or faster film and shoot about f/16. Remember, it's not sharp if the leaves and the grass are moving, which they ALWAYS are. Q-tips for the lens. Make sure they're genuine Q-tip brand COTTON. Distilled water with a few drops of Windex in it.
After only a few years more than 60 of LF and ULF photography I have learned all statements in this quote are incorrect except "...the leaves and grass are always moving."
[FONT=Comic Sans MS]Films NOT Dead - Just getting fixed![/FONT]