diff --git a/backend/camera.py b/backend/camera.py
index 8e651e5..e23c65e 100644
--- a/backend/camera.py
+++ b/backend/camera.py
@@ -1,7 +1,6 @@
 import io
 import logging
 import subprocess
-import threading
 import time
 from datetime import datetime
 
@@ -67,7 +66,6 @@ class Camera:
         self.webcam = None
         self.webcam_index = -1
         self.preview_dslr_ok = True  # True si le dernier preview DSLR a reussi
-        self._gp_lock = threading.Lock()  # Un seul appel gphoto2 a la fois
 
     def connecter(self, source=None) -> bool:
         """Connecte la camera. source: 'gphoto2', 'webcam:0', 'webcam:2', etc."""
@@ -225,8 +223,6 @@ class Camera:
             log.warning(f"Viewfinder non supporté : {e}")
 
     def _preview_gphoto2(self) -> bytes | None:
-        if not self._gp_lock.acquire(blocking=False):
-            return None  # Capture en cours, on saute ce frame
         try:
             fichier = self.camera.capture_preview()
             donnees = bytes(fichier.get_data_and_size())
@@ -241,8 +237,6 @@ class Camera:
         except gp.GPhoto2Error as e:
             log.error(f"Erreur preview DSLR : {e}")
             return None
-        finally:
-            self._gp_lock.release()
 
     def _preview_webcam(self) -> bytes | None:
         if not self.webcam or not self.webcam.isOpened():
diff --git a/frontend/js/camera.js b/frontend/js/camera.js
index 499bcd5..97af382 100644
--- a/frontend/js/camera.js
+++ b/frontend/js/camera.js
@@ -107,22 +107,17 @@ async function lancerCapture() {
   const compteurEl = document.getElementById('capture-compteur');
 
   for (let i = 0; i < nbPhotos; i++) {
-    lancerPreview();
-    await pause(500);
-
     if (nbPhotos > 1) {
       compteurEl.textContent = `Photo ${i + 1} / ${nbPhotos}`;
     }
 
-    // Lancer la capture en parallele du compte a rebours
-    const promesseCapture = apiPost('/api/capturer').catch(() => null);
-
+    // Compte a rebours SANS preview (libere la camera)
     await compteARebours();
 
-    arreterPreview();
     afficherFlash();
 
-    // Attendre la capture (devrait deja etre terminee)
+    // Preview arrete -> capture propre sans conflit gphoto2
+    const promesseCapture = apiPost('/api/capturer').catch(() => null);
     let resultat = await promesseCapture;
     let erreurReseau = false;