{"uid":"cap_bGihpB029yajuYcMeAEqF","slug":"photography-crop-factor-calculator-ac05a331","name":"Photography Crop Factor Calculator","description":"Crop factor of a sensor, with the full-frame equivalent focal length, aperture and ISO for a lens, or a custom sensor size.","url":"https://photo-calc.x402tookit.com/crop-factor?utm_source=zero.xyz","method":"GET","headers":{},"bodySchema":{"type":"object","$schema":"https://json-schema.org/draft/2020-12/schema","required":["input"],"properties":{"input":{"type":"object","required":["type","method"],"properties":{"type":{"type":"string","const":"http"},"method":{"enum":["GET"],"type":"string"},"queryParams":{"type":"object","required":[],"properties":{"iso":{"type":"number","description":"ISO to convert"},"sensor":{"type":"string","description":"full-frame, aps-c (default), aps-c-canon, aps-h, micro-four-thirds, 1-inch or medium-format-44x33"},"focalMm":{"type":"number","description":"Lens focal length to convert"},"widthMm":{"type":"number","description":"Custom sensor width in mm (with heightMm)"},"aperture":{"type":"number","description":"Lens f-number to convert"},"heightMm":{"type":"number","description":"Custom sensor height in mm"}}}},"additionalProperties":false},"output":{"type":"object","required":["type"],"properties":{"type":{"type":"string"},"example":{"type":"object","properties":{"asOf":{"type":["null","string"]},"sensor":{"type":["null","string"]},"source":{"type":["null","string"]},"reasons":{"type":["array","null"],"items":{"type":"string"}},"summary":{"type":["null","string"]},"verdict":{"type":["null","string"]},"degraded":{"type":["boolean","null"]},"sensorMm":{"type":["null","object"],"properties":{"width":{"type":["null","number"]},"height":{"type":["null","number"]},"diagonal":{"type":["null","number"]}}},"cropFactor":{"type":["null","number"]},"disclaimer":{"type":["null","string"]},"notChecked":{"type":["array","null"],"items":{"type":"string"}},"equivalentIso":{"type":["null","number"]},"equivalentFocalMm":{"type":["null","number"]},"equivalentAperture":{"type":["null","number"]},"sensorAreaRelativeToFullFramePct":{"type":["null","number"]}}}}}}},"responseSchema":null,"example":null,"exampleRequest":null,"tags":["x402"],"displayCostAmount":"0.02","displayCostAsset":"USDC","priceDynamic":false,"priceHint":null,"priceStatus":"priced","priceSource":"probe","requiresHandshake":false,"reviewCount":0,"rating":{"score":"0.00","successRate":"0.00","reviews":0,"stars":null,"state":"unrated"},"availabilityStatus":"unknown","priceObserved":null,"sessionDeposit":null,"pricing":{"kind":"static","summary":"$0.02/call","primary":{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.02","per":"call","confidence":"exact"},"accepted":[{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.02","per":"call","confidence":"exact"}]},"paymentMethods":[{"uid":"pm_oXxxV-Ifc5HvzBTF8gbIC","protocol":"x402","methodType":"crypto","chain":"base","mode":"charge","costAmount":"0.02","costPer":"request","priority":0,"asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","unit":"request","depositMicros":null,"planRef":null}],"brandName":null,"brandSlug":null,"brandBaseUrl":null,"brandDocsUrl":null,"whatItDoes":"Calculates the crop factor of a camera sensor and returns full-frame equivalent focal length, aperture, and ISO for a given lens, supporting named sensor types or custom dimensions.","exampleAgentPrompt":"What's the full-frame equivalent of a 35mm f/1.8 lens shot at ISO 800 on an APS-C sensor? Give me the crop factor and the equivalent focal length, aperture, and ISO.","exampleUseCases":[{"title":"Mirrorless lens equivalence check","prompt":"I'm using a 25mm f/1.4 lens on a Micro Four Thirds camera at ISO 400 — what would the equivalent focal length, aperture, and ISO be on a full-frame camera?"},{"title":"Canon APS-C crop factor lookup","prompt":"What's the crop factor for a Canon APS-C sensor, and what does my 50mm f/2 lens become in full-frame equivalent terms?"},{"title":"Custom sensor size conversion","prompt":"I have a camera with a custom sensor that's 17.3mm wide and 13mm tall — what's the crop factor and how does my 20mm f/2.8 lens at ISO 200 compare to full frame?"}],"resultDescription":"Returns the crop factor for the specified sensor, the sensor's physical dimensions and diagonal in mm, the sensor area as a percentage of full-frame, and (if provided) the full-frame equivalent focal length, aperture, and ISO for the given lens settings.","failureModes":["Missing or invalid sensor type returns an error or null values","Providing widthMm without heightMm (or vice versa) may result in incomplete custom sensor calculation","Out-of-range numeric inputs (e.g. negative focal length or ISO) may return null equivalents","Unknown sensor string constant returns an error or defaults to APS-C"],"whenToPreferThis":"Use this endpoint when you need to convert lens parameters (focal length, aperture, ISO) between a crop sensor and a full-frame equivalent, or when you need the crop factor and physical dimensions for a named or custom sensor. Prefer this over manual calculation or generic reference tables when you need programmatic, per-request results with custom sensor dimensions.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-11-01T12:32:10.659Z","isFirstParty":false,"canonicalSlug":"photography-crop-factor-calculator-ac05a331"}