1975: Pocono Mtns, PA. I started in the mid 70's and each week I used to collect the "BOOKS" from the local MLS office that would give you the photos' and information for residential comps. Eventually your shelves would be stocked with hundreds of "books" that you would keep for retrospective appraisals and data. For Commercials appraisals I had to visit the courthouse and look at their "STEMP(SP?)" book, now called county records, and locate a potential comparable and then map out the route and travel from comp to comp to take a photograph. I had a box of film with ISO film speeds of 20 to 1000 and used the 800 or higher speed for fast moving subjects, dimly lit situations or when using a zoom lens in low light conditions as in getting the last possible photograph as the sun sets in the west or I would use ISO 400 speed for good contrast in day light photos or ISO 20 to 200 when you have a lot of available light. and jocker to the film developer who would have the photographs ready the following day. At that time, you had to knock on doors to verify information that you might pick up from the county records, the "books" or elsewhere. Appraisals were completed by only real estate brokers with very little direction or insight from the real estate commission who, at that time, oversaw the appraisal profession. I still have my Vivitar camera, and I liked to experiment with different trick lenses, ISO speeds to adjust the depth of focus and the depth of field, as a hobby. I have an adapter and can hook my Vivitar to the telescope and take vivid photographs of the moon's craters, stars and the universe. Times have chaged