Recompute Darkroom Exposure After Filter Stops
Each filter stop doubles the light you must give back. Multiply a metered base exposure by two to the power of the added stops, and see which shots pass the longest time your process tolerates.
1 · shot | base exposure seconds | added filter stops
FIRST-LOAD
Input is processed locally and a draft is saved automatically in this browser profile when storage is available. Reset to sample clears that draft; Pro history has its own clear button. A state link encodes your inputs in its URL: share only non-sensitive rows. Browser history, clipboard and anyone receiving the link may retain it. Optional AI use below leaves this device; it is not required.
Data note: Everything runs in this browser tab on the exposure bellows scale: your shot | base exposure seconds | added filter stops stays on this device, nothing is uploaded, and the reading is rebuilt only when you press run.
Perspective: Before: Each stop doubles again: two stops is ×4, three is ×8. After: the exposure bellows scale shows the working beside each named row so the reader can change the assumption and inspect the consequence.
2 · Read the exposure bellows scale
Exposure arithmetic on your own metered numbers. Reciprocity failure, film and process behaviour are not modelled; confirm with test strips and manufacturer data before committing a shot.
Paid layer: exposure bellows scale print and history
one-time step · the free reading above stays complete
Free tier
- one complete exposure bellows scale run in the app
- three samples plus unlimited article-demo runs
- unwatermarked result text and an explicit, user-triggered state link
What $4 one-time adds
- print the exposure bellows scale with its row workings
- CSV of seconds and row explanations
- last five reading summaries saved in this browser profile
$4 once for repeated filing of the exposure bellows scale, not for a better answer. Illustrative time basis: avoiding one five-minute manual reformat per saved reading; no market-price or guaranteed-savings claim.
Local history (this device)
- No saved runs yet — your first run files here.
Checkout is unavailable until a payment link is configured. The optional unlock is browser-local, profile-scoped and best-effort, not server-verified access. Clearing browser data can remove it; there is no account or cross-device recovery.
Boundary and sources
Exposure arithmetic on your own metered numbers. Reciprocity failure, film and process behaviour are not modelled; confirm with test strips and manufacturer data before committing a shot.
- Method: The sample tolerance is sixty seconds — the longest exposure your development, film or paper handles before quality or reciprocity problems you have observed. The pushed film at 160 seconds is flagged: over two and a half times the line.
- All sample records are invented examples. The app does not fetch measurements, policies, files or personal records.
- Google’s official pricing page, fetched 2026-09-28, lists free-tier access including AI Studio. Optional formatting only; limits and availability can change. Free-tier content may be used to improve products. Never paste private records there.
Mechanism: competence-autonomy-loop
Optional AI formatting, not calculation
For this exposure bellows scale, use the free AI Studio interface only if available to you, with no paid API key. Manual entry completes the same workflow for free. Supply only fictional or non-sensitive notes. Review its output against the source; never paste unresolved questions into the numeric rows.
Format my non-sensitive notes for a exposure bellows scale. Return plain rows only: shot | base exposure seconds | added filter stops. Preserve supplied quantities exactly. Do not guess missing values; list questions separately. Do not calculate or add advice. I will check every row before pasting into the local tool.
Accepted schema: shot | base exposure seconds | added filter stops. No AI response is executed as code.