DOF and Cropping take 2

Started Feb 11, 2014 | Discussions thread
awaldram Forum Pro • Posts: 13,136
Re: DOF and Cropping take 2

Ian Stuart Forsyth wrote:

Its kind of funny as Cambridge Tutorials has got this right and even their calculator is correct as this is what I used who would have thunk EH

Yep they seem to know what there talking about despite MC's bunk

as they say on the page you refer

"Be warned that both of these terms can be somewhat misleading. The lens focal length does not change just because a lens is used on a different sized sensor — just its angle of view. A 50 mm lens is always a 50 mm lens, regardless of the sensor type."

And just above they state exactly the point I;ve been making

"As sensor size increases, the depth of field will decrease for a given aperture (when filling the frame with a subject of the same size and distance). This is because larger sensors require one to get closer to their subject, or to use a longer focal length in order to fill the frame with that subject."

i.e you alter the magnification to maintain size therefore altering CoC and intern reducing DoF.

as they state

"Note that the above calculator assumes that you have a lens on the new sensor (#2) which can reproduce the same angle of view as on the original sensor (#1). If you instead use the same lens, then the aperture requirements remain the same (but you will have to get closer to your subject)."

Again exactly what I've been saying

& it looks like I am late to the party


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