diff --git a/src/components/video-editor/VideoPlayback.tsx b/src/components/video-editor/VideoPlayback.tsx
index acc3f2e..ea477c8 100644
--- a/src/components/video-editor/VideoPlayback.tsx
+++ b/src/components/video-editor/VideoPlayback.tsx
@@ -915,22 +915,12 @@ const VideoPlayback = forwardRef<VideoPlaybackRef, VideoPlaybackProps>(
 			};
 
 			const ticker = () => {
-				const bm = baseMaskRef.current;
-				const ss = stageSizeRef.current;
-				const viewportRatio =
-					bm.width > 0 && bm.height > 0
-						? {
-								widthRatio: ss.width / bm.width,
-								heightRatio: ss.height / bm.height,
-							}
-						: undefined;
 				const { region, strength, blendedScale, transition } = findDominantRegion(
 					zoomRegionsRef.current,
 					currentTimeRef.current,
 					{
 						connectZooms: true,
 						cursorTelemetry: cursorTelemetryRef.current,
-						viewportRatio,
 					},
 				);
 
diff --git a/src/components/video-editor/videoPlayback/zoomTransform.ts b/src/components/video-editor/videoPlayback/zoomTransform.ts
index 61ced66..800949f 100644
--- a/src/components/video-editor/videoPlayback/zoomTransform.ts
+++ b/src/components/video-editor/videoPlayback/zoomTransform.ts
@@ -90,8 +90,10 @@ export function computeZoomTransform({
 	}
 
 	const progress = Math.min(1, Math.max(0, zoomProgress));
-	const focusStagePxX = baseMask.x + focusX * baseMask.width;
-	const focusStagePxY = baseMask.y + focusY * baseMask.height;
+	// Focus coordinates are stage-normalized (0-1 of full canvas),
+	// so map directly to stage pixels, not through baseMask.
+	const focusStagePxX = focusX * stageSize.width;
+	const focusStagePxY = focusY * stageSize.height;
 	const stageCenterX = stageSize.width / 2;
 	const stageCenterY = stageSize.height / 2;
 	const scale = 1 + (zoomScale - 1) * progress;
@@ -128,8 +130,8 @@ export function computeFocusFromTransform({
 	const focusStagePxY = (stageCenterY - y) / zoomScale;
 
 	return {
-		cx: (focusStagePxX - baseMask.x) / baseMask.width,
-		cy: (focusStagePxY - baseMask.y) / baseMask.height,
+		cx: focusStagePxX / stageSize.width,
+		cy: focusStagePxY / stageSize.height,
 	};
 }
 
diff --git a/src/lib/exporter/frameRenderer.ts b/src/lib/exporter/frameRenderer.ts
index 3c0fd3c..80424b0 100644
--- a/src/lib/exporter/frameRenderer.ts
+++ b/src/lib/exporter/frameRenderer.ts
@@ -540,16 +540,10 @@ export class FrameRenderer {
 	private updateAnimationState(timeMs: number): number {
 		if (!this.cameraContainer || !this.layoutCache) return 0;
 
-		const bmEx = this.layoutCache.maskRect;
-		const ssEx = this.layoutCache.stageSize;
-		const viewportRatio =
-			bmEx.width > 0 && bmEx.height > 0
-				? { widthRatio: ssEx.width / bmEx.width, heightRatio: ssEx.height / bmEx.height }
-				: undefined;
 		const { region, strength, blendedScale, transition } = findDominantRegion(
 			this.config.zoomRegions,
 			timeMs,
-			{ connectZooms: true, cursorTelemetry: this.config.cursorTelemetry, viewportRatio },
+			{ connectZooms: true, cursorTelemetry: this.config.cursorTelemetry },
 		);
 
 		const defaultFocus = DEFAULT_FOCUS;