diff --git a/docker/frontend/shared/utils/colorUtils.ts b/docker/frontend/shared/utils/colorUtils.ts
index d84b870..a2d4aa0 100644
--- a/docker/frontend/shared/utils/colorUtils.ts
+++ b/docker/frontend/shared/utils/colorUtils.ts
@@ -178,7 +178,7 @@ const SIM_EXPOSURE_BIAS_EV: Partial<Record<BaseFilter, number>> = {
 // button decides. Raise it toward 0.5 for Lightroom's full travel, and accept
 // that every recipe already saved with a non-zero EXPOSURE gets brighter with
 // it.
-const EV_PER_UNIT = 0.25;
+export const EV_PER_UNIT = 0.25;
 
 // The EXPOSURE knob and the sim bias, in stops, for the linear-light pass in
 // exportEngine. Separate from the colour matrix on purpose: the matrix works on
diff --git a/docker/frontend/shared/utils/paramDefs.ts b/docker/frontend/shared/utils/paramDefs.ts
index f62d550..51d69af 100644
--- a/docker/frontend/shared/utils/paramDefs.ts
+++ b/docker/frontend/shared/utils/paramDefs.ts
@@ -1,4 +1,5 @@
 import { ColorAdjustments } from '../types';
+import { EV_PER_UNIT } from './colorUtils';
 
 // Static metadata for the continuous (slider) adjustments of the IQ/WB/FILTERS
 // tabs — shared between AdjustmentPanel (chips + slider rows) and App (which
@@ -21,6 +22,9 @@ export interface ContinuousParamDef {
 
 const sign = (v: number) => (v > 0 ? `+${v}` : String(v));
 const oneEv = (v: number) => `${v > 0 ? '+' : ''}${v.toFixed(1)} EV`;
+// The spec reads EXPOSURE to two decimals, so "+0.50" and "-0.25" and a plain
+// "0.00" — the EV unit is already on the row's own label, not in its readout.
+const twoStops = (v: number) => `${v > 0 ? '+' : ''}${v.toFixed(2)}`;
 
 // The bipolar develop knobs read -100..+100: the spec's own numbers (the panel
 // draws every TONE and PRESENCE slider from -100 to 100, and the tone-mapping doc
@@ -28,8 +32,11 @@ const oneEv = (v: number) => `${v > 0 ? '+' : ''}${v.toFixed(1)} EV`;
 // every look has always been filed in, so the ×10 belongs to the slider and not
 // to the store: a look saved, shared or shipped in DEFAULT_RECIPES before this
 // still means exactly what it meant. A knob that is not bipolar — a temperature
-// in kelvin, an exposure in stops, a grain size in percent, an amount that only
-// goes up — keeps its own scale, because -100 of a percentage is nothing.
+// in kelvin, an amount that only goes up — keeps its own scale, because -100 of
+// a percentage is nothing. EXPOSURE is the odd one out: its slider is in stops
+// (-5..+5, two decimals, the spec's own numbers) while the store still holds the
+// ±10 units EV_PER_UNIT converts, so its accessors translate instead of scaling
+// and every recipe's brightness is untouched.
 const HUNDRED = new Set(['contrast', 'color', 'vibrance', 'highlight', 'shadow', 'whites', 'blacks', 'tint', 'denoise', 'clarity', 'dehaze', 'sharpening']);
 const deepen = (def: ContinuousParamDef): ContinuousParamDef =>
   HUNDRED.has(def.key)
@@ -45,13 +52,17 @@ export const PARAM_DEFS: {
     {
       key: 'exposure',
       label: 'EXPOSURE',
-      min: -10,
-      max: 10,
-      step: 1,
+      min: -5,
+      max: 5,
+      step: 0.01,
       defaultValue: 0,
-      display: sign,
-      get: (a) => a.exposure,
-      set: (v) => ({ exposure: v }),
+      display: twoStops,
+      // Stops out, units in: the store has carried ±10 units since the first
+      // recipe, so the knob translates rather than replacing the scale. The
+      // /4 lands on a whole 0.04 for every step the slider can emit, which keeps
+      // the stored number readable in a recipe file.
+      get: (a) => (a.exposure ?? 0) * EV_PER_UNIT,
+      set: (v) => ({ exposure: Math.round((v / EV_PER_UNIT) * 1e4) / 1e4 }),
     },
     {
       key: 'ev',