This is a great idea, but wouldn't this only work if ALL deer were the same size? It will probably work on averages, but unless your deer are all the exact same size as your control deer, your ranges will be off. Maybe not off as far to make a real difference. Have you tried this in the field? Very interesting idea. I would be interested to see how this works out for you since I have been holding off on getting a range finder.

I have ben pacing my distances before I get into the stand, and I also carry a 35mm Camera equiped with a 75mm x 300mm lense. This also doubles as my binocs, spotting scope, and range finder. The problem with using it as a range finder is determining the actual size of the animal. The Auto focus helps a great deal. Another problem is metric vs. imperial measurments. However, I have already done the "math" to know how many meters my yardage pins are set.