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Samsung 45mm vs Rokinon 85mm?

Started Apr 20, 2015 | Questions thread
wpstl Senior Member • Posts: 1,251
Re: Samsung 45mm vs Rokinon 85mm?

causey wrote:

emonstrated in the following chart:..."

To summarize: focal length "doesn't matter" as long as you change the focal distance. That is, you can obtain the same DoF with lenses of different focal lengths as long as you are willing to change the focal distance.

As DoF calculators show, DoF depends on three factors: aperture, focal distance, focal length.

Hope this helps.

Those are contradictory statements.

The truth is this:

Shoot a subject with a 50mm lens at f 5.6

Switch to a 100mm Lens and 5.6

Move back so the subject fills the frame to match the 50mm

The DOF will be the same. Only the distance has changed. The DOF looks different on longer lenses because the magnification crops out more of the image so you can't see all of the DOF.

https://luminous-landscape.com/dof2/

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