# 📐 L2 Spec — DiffuserCam Mismatch-Only Spec
**ID:** `L2-075-001` · **Status:** ⊙ Testnet (genesis catalog)
**Parents:** ⬆ Principle [`L1-075`](/artifact/l1/L1-075)
> **🎯 Tolerance (ε):** expression
> **⚖ Difficulty score:** 0.48 · **Delta tier:** 5
> **⛓ On-chain block:** 41554173
---
## 1. Domain Ω
**Type:** `range`
| Parameter | Unit | Range |
|---|---|---|
| H | px | 128 – 2048 |
| W | px | 128 – 2048 |
| Psf h | — | 64 – 512 |
| Psf w | — | 64 – 512 |
| Psf drift | — | 0.0 – 0.1 |
| Dark offset | — | 0.0 – 0.02 |
| Photon count | — | 10 – 10000 |
| Mask rotation | — | 0.0 – 0.02 |
| Chromatic aberration | — | 0.0 – 0.05 |
## 2. Tolerance (ε)
**Type:** `fn`
```
20.0 + 3.0 * log10(photon_count / 10) - 15.0 * psf_drift
```
## 3. Difficulty
| Property | Value |
|---|---|
| Difficulty score | 0.48 |
| Delta tier | 5 |
## 4. Fingerprint
`adae24ce82bb8362291c91a25b3fd1627becb48094cc356839988c5b81052bcc`
## 5. On-chain Registration
- **Chain hash:** `0xebcba85700466593dc554092575fc080b126c167413fb7914fda2f4b5b7db3f8`
- **Chain tx hash:** `0x027837d0c14f43da5124b6b595031f6a1760eeb9030b99312c61a58e765577f0`
- **Chain block:** `41554173`
---
## File Mapping
This bundle consists of: `L2-075-001.md`, `L2-075-001.json`.
| File | Role | How to regenerate |
|------|------|-------------------|
| `L2-075-001.md` | Source of truth — edit this | Human or LLM |
| `L2-075-001.json` | Structured metadata for the registry | LLM regenerates from the sections above |
**Prompt for your LLM after editing this Markdown:**
> Read the attached Markdown. Regenerate the sibling `.json` so every field matches.
> Preserve the schema documented in the rows above.
> Output each file in its own fenced code block tagged with the filename.
> Output only the JSON object.
_This Markdown was auto-synthesized from the catalog row for `L2-075-001`._
_Edit it, regenerate the JSON, and submit at [/submit](/submit) to claim the artifact._