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Lance: Please excuse me for being a bit confused. As Ben has stated, are you using BTZS, or the Zone system? If you are using the BTZS system ( which assumes that you have tested your film with your developer of choice, and have derived appropriate curves from such data ) then you simply set the meter to ASA 100 and as Laura has noted, enter the high and low EV values on your Palm Pilot using incident readings, and your exposure and developing times are provided by the program. Alternately, you can easily determine the SBR of the scene that you are photographing, and derive the appropriate exposure from your curves. The process is explained in the BTZS book as authored by Phil Davis. If you are using the zone system, then you set your meter at the ASA that you desire ( with HP5 probably between 200 and 300 depending upon your previous results ), meter the scene for the shadows using your "gray meter" ( as Bruce Barnbaum calls the exposure meter ), and lower the exposure one zone so as to place the shadows on Zone 4, or two zones to place the shadows on Zone 3. You then develop for the proper time, i.e.,N, N plus,or N minus based upon the SBR. Such developing times assumes that you have indeed determined your N time at your temperature of choice. Allow me to repeat that any "system" used for the determination of correct exposure and film development does entail some prior testing of your materials.
We would like to help you. Can you provide more information concerning your previous testing-if any?
Elliot
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