View Full Version : DOF Question

12th July 2011, 05:04 PM
Probably a dumb question but..........

When photographing the same subject with the same aperture which would have the greater depth of field a 50mm prime or a 12-60 at 25 mm, I am assuming that the camera is at a distance to fill the frame equally with the subject, i.e. closer to the subject at 25mm.

Or would it be about the same ?

12th July 2011, 05:45 PM
At f10:
25mm, distance to object 3m: 1.75m - 10m
50mm, distance to object 1.5m: 1.38 - 1.64m

At f5.6:
25mm, distance to object 3m: 1.25m - 1.88m
50mm, distance to object 1.5m: 1.43m - 1.58m

Online DOF calculator (http://www.dofmaster.com/dofjs.html) is your friend. :)

12th July 2011, 05:54 PM
wow, that's exactly what I was after thanks!

26th September 2011, 06:34 PM
some very useful info there, cheers *chr

26th September 2011, 06:47 PM
I actually find that this site (http://www.kalons.nl/dofcalcen.html) gives even better visual insight.