Quote Originally Posted by Steve Smith View Post
It will only change if you enlarge the 35mm frame more than the wide frame.
David is right, my wording is wrong.

Depth of field is defined by acceptable sharpness and by circle of confusion.

Enlarging a frame of 24x65 to a width of 12" may look accepatable. If you then enlarge a frame of 24x36 to a width of 12", which is almost twice as much enlargement, the sharpness may no longer be acceptable.