Full-frame equivalent f-number to aperture f-number at APS-H 27.9mm

1 Equivalent aperture = 0.775194 Aperture · profile-dependent conversion · context: sensor profile

Direct Answer

1 Equivalent aperture equals 0.775194 Aperture

This result depends on the selected profile context: sensor profile.

For 2 Equivalent aperture, this profile returns 1.550388 Aperture.

Converter Calculator

1 Equivalent aperture (f-number, DoF basis) =
0.775194 Aperture (f-number)

Explanation

APS-H 27.9mm uses crop factor 1.29 and sensor width 27.9 mm. f_number = equivalent_f / 1.29. For input 1 eq f, output is 0.77519379845 f.

Equivalent aperture to Aperture is profile-bound here: the selected sensor profile controls the mapping used by calculator and reference table.

Read more

Keep the same profile in both directions to avoid mixing lookup systems that use different size mappings.

Method & Reference (Verified)

  • Method basis: profile-bound mapping; constants depend on the selected profile encoded in the route.
  • Profile reference: sensor profile.
  • Consistency rule: keep the same profile in mirror direction to avoid mixing incompatible mappings.

Common Conversion Values

Equivalent aperture (f-number, DoF basis)Aperture (f-number)
1 0.775194
2 1.550388
5 3.875969
10 7.751938
14 10.852713
18 13.953488
24 18.604651
35 27.131783
50 38.75969
85 65.891473
100 77.51938
135 104.651163
200 155.03876