Quote Originally Posted by Shebang
Okay, I can't let it go, yet. So, I sat here and thought about the academic gains of the day. This is a test.

(1) Focal length equals the "size" of the lens. For example, the focal length of my 50m prime is 50m, and the focal lengths of my 17-40 zoom is 17 or 40 or a number in between. (This is computed based on a math formula using the measurement of distance from basically the center of the lens to the sensor or film - which I could care less to know. I hate math).

(2) DOF is the specific range or zone or plane that is perceived as acceptably sharp, and utilizes a concept known as Circle of Confusion. ( -- aptly named.)

(3) Hyperfocal Point is the maximum Depth of Field attainable in a given scenario, and is determined by a math formula using the focal length, the aperture, and an acceptable Circle of Confusion. (Again, I hate math.)

(4) The DOF of a particular Hyperfocal focus point begins halfway in front of that focus point. IOW, the Hyperfocal sharpest focus distance using a 50m prime on a 1.6 crop sensor camera at an aperture of F/8 is 54.1 feet. At this distance, the CoC is .019mm. Therefore, the closest thing in acceptable focus (or the front of the DOF plane) would start at 27.5 feet. Sharpness of focus would increase as one reaches the 54.1 feet marker and then begin to lose sharpness, finally reaching an unacceptable clarity at a point just before "infinity."

Do I correctly understand these terms/concepts? Did I pass the test??

Thanks again for staying with me on this. I appreciate each and every one of you for wading through this...
Almost.

(4) - For what we are doing here, the CoC is a function of the sensor size (does not change with distance). The acceptable focus would include infinity, not "just before" infinity.

TF