Camera Focal EquivalenceAperture F Number to Full Frame Equivalent F Number At Smartphone 1 1 3

Aperture (f-number) to Equivalent aperture (f-number, DoF basis) for Smartphone 1/1.3" class

Snapshot

On Smartphone 1/1.3" class, f/5.6 corresponds to about f/21 on a full-frame depth-of-field basis. Conversion Encyclopedia keeps the same sensor profile across the calculator, common values, and reverse page for this page.

Sensor profile: Smartphone 1/1.3" class (9.6 mm width, crop factor 3.75).
Example: For 1.4 Aperture (f-number), this corresponds to 5.25 Equivalent aperture (f-number, DoF basis) on Smartphone 1/1.3" class.

Interactive conversion

Converter Calculator

Decimals: 1.5 or 1,5. Fractions: 1/2. Scientific notation: 1e3. Write 1000 without grouping separators.

3.75 Equivalent aperture (f-number, DoF basis)

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API and AI agent access

Aperture (f-number) to Equivalent aperture (f-number, DoF basis) for Smartphone 1/1.3" class. sensor profile: smartphone-1-1-3.

Machine-readable identifiers

Conversion family: camera-focal-equivalence
Source unit: aperture_f_number
Target unit: full_frame_equivalent_f_number
Sensor profile: smartphone-1-1-3

Use these identifiers in the API request. Sources and model limits also apply to software clients.

Example API request and response

POST /api/v1/convert

Request

{
  "family": "camera-focal-equivalence",
  "value": 1,
  "from": "aperture_f_number",
  "to": "full_frame_equivalent_f_number",
  "parameters": {
    "sensorProfile": "smartphone-1-1-3"
  }
}

Essential response

{
  "ok": true,
  "conversion": {
    "family": "camera-focal-equivalence",
    "value": 1,
    "from": "aperture_f_number",
    "to": "full_frame_equivalent_f_number",
    "result": {
      "raw": 3.75,
      "display": "3.75"
    },
    "canonicalPath": "/camera-focal-equivalence/aperture-f-number-to-full-frame-equivalent-f-number-at-smartphone-1-1-3/"
  }
}

API, OpenAPI and WebMCP documentation

Explanation

Smartphone 1/1.3" class uses crop factor 3.75 and sensor width 9.6 mm. equivalent_f = f_number x 3.75. For input 1 f, output is 3.75 eq f. Exposure does not change with this equivalence; the f-number still transmits the same light, and the equivalence here is depth-of-field framing only.

Method & Sensor Profile

Sensor basis: Smartphone 1/1.3" class profile with crop factor 3.75 and sensor width 9.6 mm.
Profile reference: focal-length and aperture equivalence use the same crop model, while angle-of-view routes use the same fixed sensor width geometry.
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	5.25
2	7.5
2.8	10.5
4	15
5.6	21
8	30
11	41.25
16	60

Questions & answers

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 Smartphone 1/1.3" class, crop factor 3.75, sensor width 9.6 mm.

How do I reverse f to eq f for Smartphone 1/1.3" class?

Use the opposite-direction page for Smartphone 1/1.3" class 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.