Nikonian72 wrote:
Establishing a true macro-photograph with your camera & lens.
1.) Set your lens to Manual focus;
2.) Turn lens focusing collar to Minimum Focusing Distance;
3.) Aim camera at ruler;
4.) Move entire camera/lens in-&-out towards ruler;
5.) when in focus, take photograph.
You should capture about 13/16-inch (approximately 23-mm) on your sensor.
Repeat procedure on feather. This is a true macro capture.
And for FF, it would be pretty close to 36mm....