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Exposure Calculator

ISO/aperture/shutter exposure calculator, equivalent-exposure cheat sheets and Sunny 16 math

Unify Dynamics LLC

Documentation
Tools9read-only
Sign-inNoneno account, no key
Data keptNoneprocessed in memory
PriceFreeoptional Pro limits
StatusLiveMCP + REST
Works withMCP · RESTany agent

Try asking

Real questions, and the tools your agent calls to answer them.

I'm at f/8 1/125 ISO 100, what shutter speed do I need at f/16?
Tools called
adjust_exposure
Give me equivalent exposures around f/4 1/500 at ISO 200
Tools called
equivalent_exposure_table
How many stops between f/2.8 and f/8?
Tools called
stops_between
What's the Exposure Value of f/8 at 1/125?
Tools called
exposure_value
EV 12 at f/8, what shutter speed do I need?
Tools called
ev_to_settings
What settings should I start with for a night city street photo?
Tools called
scene_preset
What scenes do you have starting settings for?
Tools called
list_scenes
Sunny 16 shutter speed for overcast light at f/8
Tools called
sunny16_calculator
What does reciprocity mean in photography?
Tools called
exposure_glossary

About

Lumeratio is a fully local exposure-triangle (ISO/aperture/shutter speed) calculator and cheat sheet. adjust_exposure takes a correctly-exposed baseline, one setting that changed, and which of the other two to solve for, using real stops-based reciprocity math. equivalent_exposure_table generates a cheat-sheet of equivalent aperture/shutter pairs at a fixed ISO, several full stops wider and narrower than a baseline. stops_between computes how many stops separate two ISO, aperture or shutter-speed values. exposure_value computes the Exposure Value for an aperture/shutter/ISO combination; ev_to_settings converts an EV back into a matching setting. scene_preset gives a hand-curated recommended starting exposure for 15 named scenes (bright sun, overcast, golden hour, indoor lighting at three brightness levels, night city, astrophotography, action sports indoor/outdoor, fireworks, backlit portraits) with a plain-language note; list_scenes browses them all. sunny16_calculator applies the classic Sunny 16 rule and its cloudy/shade variants to compute a correct shutter speed without a meter. exposure_glossary defines core terms: stop, exposure value, exposure triangle, reciprocity, Sunny 16, ISO invariance, latitude, the 500 rule, base ISO. Keyless; fully local; zero upstream calls; nothing stored.

Sources: Real computation (stops-based exposure reciprocity, Exposure Value formula, Sunny 16 rule arithmetic); scene presets are hand-curated from standard, decades-stable photographic convention, not a figure that changes over time; fully local, zero upstream calls

Privacy

The publisher, Unify Dynamics LLC, states that tool inputs are processed in memory and not retained.

Data not collectedNo account, no profile, no stored prompts or results.
Privacy policyTerms

What it can do

9 tools, grouped by job. Every one is read-only or compute-only.

OpenAPI
Solve & Compare3 tools
  • Adjust exposureGiven a correctly-exposed ISO/aperture/shutter baseline, one setting that changed, and which remaining setting to solve for (the third stays…
  • Equivalent exposure tableGenerates a cheat-sheet table of equivalent full-stop aperture/shutter pairs at a fixed ISO, centered on a baseline.
  • Stops betweenHow many stops separate two values of the same kind (ISO, aperture f-number, or shutter speed in seconds), and which direction is more light.
Exposure Value2 tools
  • Exposure valueComputes the Exposure Value (EV) for an aperture/shutter/ISO combination, both at ISO 100 (the standard EV reference) and at the given ISO.
  • Ev to settingsConverts an Exposure Value back into a matching aperture or shutter speed, given the other setting fixed and an ISO.
Scenes & Sunny 163 tools
  • Scene presetA hand-curated recommended starting ISO/aperture/shutter for a named scene, with a plain-language note.
  • List scenesEvery scene preset Lumeratio covers, with its recommended settings.
  • Sunny16 calculatorApplies the classic Sunny 16 rule (f/16 at 1/ISO in full sun, opening a stop per step of cloudier light) to compute the correct shutter speed for…
Glossary1 tools
  • Exposure glossaryDefinitions of core exposure terms: stop, exposure value, exposure triangle, reciprocity, Sunny 16 rule, ISO invariance, full stop, latitude, the…

Information

PublisherUnify Dynamics LLC
CategoryDesign & creative · Everyday life
LanguagesEnglish
Built forWorldwide
CompatibilityAny MCP client · any agent · REST
Version0.1.0
MCP endpointhttps://lumeratio.connectorbay.com/mcp
REST APIopenapi.json
SupportGet help · Status
CountryWorldwide

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Documentation

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What Lumeratio is for

"I'm at f/8 1/125 ISO 100, what shutter speed do I need at f/16?", "give me equivalent exposures around f/4 1/500", "what settings should I start with for a night city street shot?" — real exposure-triangle math and a cheat sheet, not a vague explanation of "more light, less light."

What it does

adjust_exposure takes a correctly-exposed ISO/aperture/shutter baseline, one setting that changed to a new value, and which of the remaining two settings to solve for — real stops-based reciprocity math, not a lookup table. equivalent_exposure_table generates the cheat sheet photographers keep in their head: every equivalent aperture/shutter pair a few full stops wider and narrower than a baseline, at a fixed ISO. stops_between computes exactly how many stops separate two ISO, aperture, or shutter-speed values and which direction is more light. exposure_value computes the Exposure Value (EV) for a setting combination; ev_to_settings converts an EV number back into a matching aperture or shutter speed. scene_preset gives a hand-curated recommended starting exposure — with a plain-language note on why — for 15 named scenes: bright sun, slight/heavy overcast, golden hour, three levels of indoor lighting, night city streets, astrophotography, daylight and indoor sports, fireworks, and backlit portraits (list_scenes browses them all). sunny16_calculator applies the classic Sunny 16 rule and its cloudy/shade variants to compute a correct shutter speed without a meter at all. exposure_glossary defines the core vocabulary: stop, Exposure Value, exposure triangle, reciprocity, Sunny 16, ISO invariance, full stop, latitude, the 500 rule, base ISO.

What it is not

Not a light meter and not a substitute for one. Scene presets are starting points based on standard, decades-old photographic convention (the Sunny 16 rule and its common variants) — real light varies with latitude, season, time of day, haze and your specific camera and lens, so treat every preset as a place to start metering from, not a guaranteed correct exposure. All of the math here is standard photographic stops/EV arithmetic, computed locally every time.

Privacy policy

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Lumeratio — Privacy Policy

Effective 25 September 2026. Unify Dynamics LLC ("we", "us"), Menlo Park, California.

What Lumeratio is. Lumeratio is a connector (an MCP server and REST API) that AI assistants and personal agents call on your behalf for a fully local exposure-triangle (ISO/aperture/shutter speed) calculator and cheat sheet: solving for a changed setting, generating equivalent-exposure tables, computing stops and Exposure Value, applying the Sunny 16 rule, and giving a hand-curated reference of starting settings for common scenes. You interact with your assistant; the assistant sends us only the arguments needed for that one lookup or calculation.

What we receive. The arguments of each tool call — an ISO, aperture, shutter speed, a scene name, a light condition, or an Exposure Value — the technical headers needed to serve the request (an IP address or a client identifier supplied by the assistant, and a Pro API key if you have one), and standard server logs.

Everything is answered from bundled reference data and/or local computation, and nothing is stored. No request is forwarded to any third party — there is no upstream call at all, live or otherwise — and no query is logged in request bodies, recorded, or used to train anything.

What we do not receive or store. We do not receive your conversation with the assistant or your name, and we do not build a profile from your queries: each request is answered independently and nothing carries over between requests. Rate-limit counters (a client identifier and timestamps) are held in memory for at most 24 hours. Hosting-provider access logs, which contain IP addresses and request paths but not request bodies, are retained for up to 30 days for security and abuse prevention.

Sub-processors. None — the entire dataset is bundled with the server and answered locally. Hosting: Vercel (United States regions).

Legal bases and your rights. Our processing is necessary to provide the service you request through your assistant. Because we store no personal data beyond short-lived logs, requests to access, correct or delete personal data are usually satisfied automatically; you can still contact agent@connectorbay.com and we will respond within 30 days. We do not sell or share personal information and do not use your data to train models.

Children. Lumeratio is a general-audience service operated by the adult using the assistant.

Changes. We will post changes here with a new effective date.

Terms of service

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Lumeratio — Terms of Service

Effective 25 September 2026. These terms govern use of the Lumeratio connector ("the Service") operated by Unify Dynamics LLC ("we", "us").

  1. The Service. Lumeratio returns real exposure-triangle calculations (stops, Exposure Value, Sunny 16 arithmetic) and a hand-curated reference of starting exposure settings for common photographic scenes. It is accessed through an AI assistant or directly over MCP or HTTP.
  2. Not a light meter. Lumeratio is an independent calculator and reference tool, not a substitute for metering a scene yourself. Scene presets are starting points based on standard photographic convention — real light varies with latitude, season, time of day, haze and your specific equipment.
  3. Reference, not real-time guidance. Content reflects general, widely published practice as of the build date stated in the Service's own data or responses. It does not know your specific situation, equipment, or context, and it cannot replace judgment formed through experience or professional consultation where relevant.
  4. Acceptable use. Automated use within the published rate limits is welcome.
  5. Availability. The Service is provided "as is" without warranty. We may change, limit or discontinue it at any time.
  6. Data. Our Privacy Policy describes what we process. In short: your request is answered from bundled reference data and/or local computation, and nothing is stored.
  7. Pro keys. Optional Pro API keys are issued at our discretion, are personal to the holder and may be revoked for abuse.
  8. Liability. To the fullest extent permitted by law, Unify Dynamics LLC is not liable for any loss, injury, or damage arising from use of, or reliance on, the Service. Our total liability is limited to US $100.
  9. Governing law. California law; venue in San Mateo County, California.
  10. Contact. Unify Dynamics LLC · agent@connectorbay.com · https://connectorbay.com/lumeratio

Support

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Exposure Calculator support

Email agent@connectorbay.com. We answer within two business days.

When you report a problem, include the question you asked your agent, roughly when, and which agent you used (for example Claude, ChatGPT or Gemini). Never send us passwords, account numbers or ID numbers. Exposure Calculator never asks for them.

Get Exposure Calculator

Free · No sign-in · Read-only

Streamable HTTP, stateless, no authentication. Paste the endpoint into any MCP-capable agent.

https://lumeratio.connectorbay.com/mcp
{
  "mcpServers": {
    "lumeratio": {
      "type": "http",
      "url": "https://lumeratio.connectorbay.com/mcp"
    }
  }
}