The problem with such data collections is that while people may make their own tests and have confidence in their data, the data in each case was not obtained under controlled conditions. Each person will have their own perferences, equipment, darkroom methods, and requirements. This all determines what they consider to be normal. If you look at existing data there is often only the roughest correlation between the various entries. Jerry -----Original Message----- From: pure-silver-bounce@xxxxxxxxxxxxx [mailto:pure-silver-bounce@xxxxxxxxxxxxx] On Behalf Of Bob Adler Sent: Friday, September 22, 2006 2:01 PM To: pure-silver@xxxxxxxxxxxxx Subject: [pure-silver] Zone Data Project I was wondering if folks on this list would be interested in compiling a spreadsheet for everyone to share that provided information on film, N(x) ASA, developer, development time, etc.. I would be willing to park this spreadsheet on my web host for anyone to download and would keep it current. And of course this is a purely selfish endeavor as I would love to have the data available for my own use. I understand that to be right on the money with use of the zone system, each emulsion batch should be tested and that there is a lot of judgement in arriving at the correct ASA and development time. Additionally consistent development procedures are very important and some emulsion/developers require very specific and refined technique and measurement to obtain the best result. That being said, for those of us who can live with the 90 percent rule (obtain 90 percent of the benefit of the zone system with 10 percent of the work), this would be a great source. If enough folks think this would be a worthwhile project, I would be happy to manage it. The best way for me to guage interest would be to categorize listers into 2 categories; those who would be interested and have data they can contribute, and those, like myself, who would love to have the data. So, if you are interested, send me an email reply at : rgacpa@xxxxxxxxxxx and indicate whether or not you can contribute data, I'll compile the results. I'll report back only if there seem to be enough interested folks and enough contributors. Thanks, Bob Bob Adler Palo Alto, CA http://www.raflexions.com