Source: https://guthlabs.ai/docs/instruments/diffraction-limit-optimal-aperture-calculator/implementation/

instrument implementation / implementation-contract

# Diffraction Limit / Optimal Aperture Calculator implementation

A source-bound implementation contract for Diffraction Limit / Optimal Aperture Calculator; deployment and executable qualification remain separate.

Status: **VERIFIED_CLEAN**Lifecycle: **implementation-contract**

## Binding contract

This record describes what an executable surface must bind and validate. It does not claim that a public calculator, package, or production route is deployed.

**Record owner**: Guth Instruments

**Lifecycle**: verified-clean

**Evidence ID**: t5-077

**Effect**: Computation or source lookup only

## Input and validation requirements

The specification does not state validation behavior for zero megapixels, zero or negative pixel pitch, or other nonphysical inputs. Zero megapixels creates a division-by-zero during derived pixel-pitch calculation, while negative pixel pitch produces sign-dependent and physically invalid outputs unless explicitly rejected or converted to an absolute magnitude.

## Required corrections

No binding erratum is attached to this unique-name record. Implementers must still preserve the declared units, domain, and failure behavior.

## Inspectable interface fixture

The sample below is evidence for interface and validation tests, not a production implementation.

````
{
  "inputs": {
    "manual_pixel_pitch_mm": 0.004,
    "wavelength_mm": 0.00055
  },
  "expected_outputs": {
    "diffraction_limited_f_number": 5.961252,
    "airy_disk_diameter_mm": 0.008
  },
  "working": "1.22*λ = 1.22*0.00055 = 0.000671 mm. N = 0.004/0.000671 = 5.961252. Airy diameter = 2.44*0.00055*5.961252 = 0.008000 mm, equivalently 2*0.004 = 0.008000 mm."
}
````

## Other records

[01**Overview**](<https://guthlabs.ai/docs/instruments/diffraction-limit-optimal-aperture-calculator/>)[02**Mechanism**](<https://guthlabs.ai/docs/instruments/diffraction-limit-optimal-aperture-calculator/mechanism/>)[04**Qualification**](<https://guthlabs.ai/docs/instruments/diffraction-limit-optimal-aperture-calculator/qualification/>)

## Sources and evidence

These pointers bind the page to evidence. They do not grant authority or collapse verification into deployment.

- `VERIFIED_LEDGER.json`

- `evidence-tranche5/tranche5-results.json`