quick question on depth of field..

[Rippie]

Say you have 2 lenses

an 85mm F2
and a 85mm F1.4


Both lenses set to F2

will they both have similar depths of field?
Or because the F2 lens is fully open and the F1.4 lens isn't fully open will they
be different?

 

[Texanite]

if both lenses are set to f2, they will provide the same dof

dof is a mathmatical calculation

 

[Rippie]

thank you.

 

[Texanite]

thank you.

No problem. But are you ready for this? Those two lenses both set at f2 might NOT provide the same amount of light to your camera. The f2 on the slower lens might be darker than an f2 on the lens that opens to a 1.4

 

[AwakenedFilms]

Also, it is very likely that the 85mm f1.4 set to f2 will be sharper than the 85mm f2 set to f2.

J