Aperture (f-number) to Equivalent aperture (f-number, DoF basis) for APS-H 27.9mm

1 Aperture (f-number) = 1.29 Equivalent aperture (f-number, DoF basis) · camera-equivalence calculation for APS-H 27.9mm

Direct Answer

On APS-H 27.9mm, f/5.6 corresponds to about f/7.224 on a full-frame depth-of-field basis

This result uses the fixed APS-H 27.9mm sensor profile (crop factor 1.29).

For 1.4 Aperture (f-number), this corresponds to 1.806 Equivalent aperture (f-number, DoF basis) on APS-H 27.9mm.

Converter Calculator

1.29 Equivalent aperture (f-number, DoF basis)

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Explanation

Formula: equivalent_f = f_number x 1.29. Why: this page keeps APS-H 27.9mm fixed, so crop factor and sensor width stay explicit for every calculation.

APS-H 27.9mm: a sensor profile with crop factor 1.29 and sensor width (horizontal) 27.9 mm, used as the fixed framing basis for this page.

Aperture (f-number): a camera-equivalence quantity in this family that depends on the selected crop model.

Equivalent aperture (f-number, DoF basis): a camera-equivalence quantity in this family that depends on the selected crop model.

This route is useful when you know the actual lens aperture on APS-H 27.9mm and want the full-frame depth-of-field equivalent.

This page is sensor-profile dependent rather than universal because camera equivalence changes with sensor geometry (APS-H 27.9mm).

Method & Sensor Profile

Model basis: APS-H 27.9mm sensor profile with crop factor 1.29 and sensor width 27.9 mm.
Profile reference: APS-H 27.9mm (crop factor 1.29, sensor width 27.9 mm).
Consistency rule: forward and reverse pages keep the same sensor profile; only the formula direction changes.

Common Conversion Values

Aperture (f-number)	Equivalent aperture (f-number, DoF basis)
1.4	1.806
2	2.58
2.8	3.612
4	5.16
5.6	7.224
8	10.32
11	14.19
16	20.64

Frequently Asked Questions

Which sensor assumptions are fixed for aperture f-number to full-frame equivalent f-number?

Aperture f-number to full-frame equivalent f-number is fixed to APS-H 27.9mm, crop factor 1.29, sensor width 27.9 mm.

How do I reverse f to eq f for APS-H 27.9mm?

Use the opposite-direction page for APS-H 27.9mm to convert equivalent aperture (f-number, dof basis) back to aperture (f-number) with the same sensor assumptions.

Can aperture f-number to full-frame equivalent f-number replace full lens-design simulation?

No. Aperture f-number to full-frame equivalent f-number provides framing and geometry approximations, not full optical-model behavior.

Does equivalent f-number change exposure?

No. Equivalent f-number here is for depth-of-field comparison only. Exposure (light transmission) does not change.