{"id": "card_works_exposure", "kind": "verified", "title": "The exposure value of a camera setting", "body": "At f/8 and 1/250 s the exposure value is EV = log₂(N²/t) ≈ 13.97 — the single number that makes a bright beach and a dim room comparable.  Worked & sealed by the engine — EV = log₂(8² / 0.004) ≈ 13.97.  [HOLDS; open the seal to re-check.]", "source": {"label": "The Works — worked & sealed", "url": "https://narrowhighway.com/s/8bf5f6ed714e882d46a60b3c72db963572c7ae1bb0c6fac47b2c7bd4a6dff8c9", "domain": "photography", "authority_tier": "verified"}, "shelf": "the-works", "box": "engineering", "bands": ["the-works", "engineering", "photography", "photography", "/", "optics"], "connections": [{"to_card_id": "card_spine_the-works", "relationship": "member_of", "evidence": "a member of the the-works shelf in the keeping"}, {"to_card_id": "card_k_floor_of_discovery", "relationship": "paves", "evidence": "A worked, engine-sealed demonstration — a paving-stone of the floor of reality."}, {"to_card_id": "card_v_bc1ea7c080be", "relationship": "demonstrates", "evidence": "A worked demonstration in the same field (photography)."}, {"to_card_id": "card_works_six_sigma", "relationship": "adjacent", "evidence": "Neighbouring worked demonstrations in the same part of the volume."}, {"to_card_id": "card_works_knapsack", "relationship": "adjacent", "evidence": "Neighbouring worked demonstrations in the same part of the volume."}, {"to_card_id": "card_works_luhn", "relationship": "adjacent", "evidence": "Neighbouring worked demonstrations in the same part of the volume."}, {"to_card_id": "card_works_density", "relationship": "adjacent", "evidence": "Neighbouring worked demonstrations in the same part of the volume."}], "author": "engine", "created_at": 0.0, "updated_at": 0.0, "visibility": "public", "lifecycle_stage": "public", "volatility": "permanent", "surface": "secular", "generated": false, "subject": "Photography / optics", "extra": {"seal_hash": "8bf5f6ed714e882d46a60b3c72db963572c7ae1bb0c6fac47b2c7bd4a6dff8c9", "cite_url": "https://narrowhighway.com/s/8bf5f6ed714e882d46a60b3c72db963572c7ae1bb0c6fac47b2c7bd4a6dff8c9", "demonstration_id": "works_exposure", "verdict": "HOLDS"}, "presentation": {"glyph": "•", "kind_label": "engineering", "by": "The Works — worked & sealed", "authority": "verified", "posted": "", "standing": "", "link": {"url": "https://narrowhighway.com/s/8bf5f6ed714e882d46a60b3c72db963572c7ae1bb0c6fac47b2c7bd4a6dff8c9", "host": "narrowhighway.com", "provider": "", "titled": "The exposure value of a camera setting", "waybill_line": "", "reach": "", "embed": ""}}, "neighbors": [{"id": "card_spine_the-works", "title": "The Works — sealed, worked demonstrations", "relationship": "on the shelf of", "why": "a member of the the-works shelf in the keeping", "href": "/card/card_spine_the-works", "resolved": true}, {"id": "card_k_floor_of_discovery", "title": "The Floor of Discovery — one floor, and by its design the fear of God", "relationship": "paves", "why": "A worked, engine-sealed demonstration — a paving-stone of the floor of reality.", "href": "/card/card_k_floor_of_discovery", "resolved": true}, {"id": "card_v_bc1ea7c080be", "title": "EV = log₂(8² / 0.004) ≈ 13.97", "relationship": "demonstrates", "why": "A worked demonstration in the same field (photography).", "href": "/card/card_v_bc1ea7c080be", "resolved": true}, {"id": "card_works_six_sigma", "title": "What 'six sigma' actually means", "relationship": "adjacent", "why": "Neighbouring worked demonstrations in the same part of the volume.", "href": "/card/card_works_six_sigma", "resolved": true}, {"id": "card_works_knapsack", "title": "The best a knapsack can carry", "relationship": "adjacent", "why": "Neighbouring worked demonstrations in the same part of the volume.", "href": "/card/card_works_knapsack", "resolved": true}, {"id": "card_works_luhn", "title": "The check digit that catches a mistyped number", "relationship": "adjacent", "why": "Neighbouring worked demonstrations in the same part of the volume.", "href": "/card/card_works_luhn", "resolved": true}, {"id": "card_works_density", "title": "Density from mass and volume", "relationship": "adjacent", "why": "Neighbouring worked demonstrations in the same part of the volume.", "href": "/card/card_works_density", "resolved": true}]}