FULL FRAME VS APSC DEPTH OF FIELD (THE TRUH)

Started 2 months ago | Discussions thread
PhotonBeam Forum Member • Posts: 73
Re: FULL FRAME VS APSC DEPTH OF FIELD (THE TRUH)

mostlyboringphotog wrote:

LASR wrote:

This seems a very confusing way to present things. Why not just say that a 50 mm lens in FF has the same field of view as 50/1.5 = 33.3 mm (35 mm) lens in APS-C (if the crop factor is 1.5x).

Since the amount of light, depth of field, depends on the physical aperture (as BF said) the aperture of a 50 mm lens at f2.0 is 50/2.0 = 25 mm, the same aperture on a 35 mm lens corresponds to f1.4, 35/25 = 1.4, therefore, 50 mm f2.0 in FF has the same field of view and depth of field as 35 mm f1.4 in APS-C.

To be a bit more stickler -

50mm f/2.0 and 35mm f/1.4 may have the same ~25mm aperture diameter but 50mm f/2 has 1.5x more (deeper) DOF than 35mm f/1.4. However, Fuji APS-C is enlarged by 1.5x crop factor relative to the FF sensor, making the APS-C sensor 1.5x shallower DOF, which cancels out the deeper DOF of 50mm f/2 lens.

Same aperture (entrance pupil) diameter does not keep the DOF same (THE TRUTH)

The circle of confusion strikes again.

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