[pure-silver] Re: Bellows factor and DOF

C.Breukel@xxxxxxx wrote:

[...]
Does that mean that the longer focal length has a much bigger effect on
DOF that the smaller F stop?..
To unwind this problem, let us agree that when you are concerned with focus at the film plane, it is Depth of Focus and when concerned with focus at the subject, it is Depth of Field. Depth of Focus (the film plane) increases with focal length, while the opposite happens in Depth of Field. 

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