wickerprints, it is my understanding that "precise" distance measurement from the focus point is not critical, since some claim that you can use the focal plane of the sensor, or the end of the lens. In this case, it falls within the 15 feet 10 inches, since the lens length is beyond the 2 inch difference.


I don't understand the CoC not being 0.03, when the 5D Mk 2 is listed as such: http://www.dofmaster.com/digital_coc.html


How then can I ever use a graph or equation, if I can't presume the CoC is as listed? I'd never be able to find the hyperfocal distance if I can't start with what is known.


And, as for the f/stop and focal length, if I can't rely on those (especially with a lens that shows that I did, indeed, have the correct f/stop and focal length in the EXIF data), then combined with the "unknown" CoC, I might as well throw the graphs and technique in the trash bin.


There must be more to it than this.