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.
- Use the reverse page if you need the opposite direction with the same basis.
Use the interactive calculator below for custom values and the common-value table for quick checks.
Interactive conversion
Converter Calculator
3.75 Equivalent aperture (f-number, DoF basis)
SwitchMachine access
Available to apps and AI agents
Aperture (f-number) to Equivalent aperture (f-number, DoF basis) for Smartphone 1/1.3" class can be requested through Conversion Encyclopedia's structured interfaces by software and compatible AI agents. The smartphone-1-1-3 sensor profile tells the conversion engine which camera sensor setup belongs to the calculation.
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
The JSON API and OpenAPI specification use the identifiers to reach the conversion engine. WebMCP lets compatible AI agents request the same calculation.
Example API request and response
POST /api/v1/convertRequest
{
"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/"
}
}Explanation
Formula: equivalent_f = f_number x 3.75. Why: this page keeps Smartphone 1/1.3" class fixed, so crop factor and sensor width stay explicit for every calculation.
Smartphone 1/1.3" class: a sensor profile with crop factor 3.75 and sensor width (horizontal) 9.6 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 Smartphone 1/1.3" class 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 (Smartphone 1/1.3" class).
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.