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

1 Equivalent aperture (f-number, DoF basis) = 0.775194 Aperture (f-number) · camera-equivalence calculation for APS-H 27.9mm

Direct Answer

On APS-H 27.9mm, a full-frame equivalent aperture of f/5.6 needs about f/4.341085

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

To match 1.4 Equivalent aperture (f-number, DoF basis), you need 1.085271 Aperture (f-number) on APS-H 27.9mm.

Converter Calculator

0.775194 Aperture (f-number)

Switch

Explanation

Formula: f_number = equivalent_f / 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.

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

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

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

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

Equivalent aperture (f-number, DoF basis)	Aperture (f-number)
1.4	1.085271
2	1.550388
2.8	2.170543
4	3.100775
5.6	4.341085
8	6.20155
11	8.527132
16	12.403101

Frequently Asked Questions

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

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

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

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

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

No. Full-frame equivalent f-number to aperture 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.