diff --git a/backend/camera.py b/backend/camera.py
index 7b9f158..ba729c8 100644
--- a/backend/camera.py
+++ b/backend/camera.py
@@ -146,24 +146,22 @@ class Camera:
         else:
             return self._capture_simulation(chemin_dest)
 
-    def _declencher_af_liveview(self):
-        """Déclenche l'autofocus LiveView Canon avant la capture (best-effort)."""
-        try:
-            cfg = self.camera.get_config()
-            af = cfg.get_child_by_name("autofocusdrive")
-            af.set_value(1)
-            self.camera.set_config(cfg)
-            time.sleep(0.4)  # Attendre que l'AF se verrouille
-        except Exception:
-            pass  # Non supporté sur ce modèle ou en mode MF
-
     def _capture_gphoto2(self, chemin_dest: Path) -> Path | None:
         from PIL import Image as PILImage
 
         for attempt in range(3):
             try:
                 with self._gp_lock:
-                    self._declencher_af_liveview()
+                    # Désactiver LiveView : miroir abaissé → AF phase-détection Canon disponible
+                    try:
+                        cfg = self.camera.get_config()
+                        vf = cfg.get_child_by_name("viewfinder")
+                        vf.set_value(0)
+                        self.camera.set_config(cfg)
+                        time.sleep(0.2)  # Laisser le miroir descendre
+                    except Exception:
+                        pass
+                    log.info(f"Déclenchement capture DSLR (tentative {attempt+1}/3)")
                     chemin_camera = self.camera.capture(gp.GP_CAPTURE_IMAGE)
                     fichier_camera = gp.CameraFile()
                     self.camera.file_get(
diff --git a/backend/main.py b/backend/main.py
index b98c6a3..bdcd38a 100644
--- a/backend/main.py
+++ b/backend/main.py
@@ -259,19 +259,30 @@ async def api_config_update(modifications: dict):
 
 @app.post("/api/capturer")
 async def api_capturer():
-    global capture_en_cours
+    global capture_en_cours, _preview_actif
     # Verifier le compteur
     etat = compteur_restant()
     if etat["actif"] and etat["restantes"] <= 0:
         return JSONResponse({"erreur": "Limite de photos atteinte"}, status_code=403)
 
     capture_en_cours = True
-    _preview_actif = False  # Eviter faux camera_erreur si race condition HTTP avant preview_stop
+    _preview_actif = False  # Eviter faux camera_erreur (race condition HTTP avant preview_stop)
+    log.info("Capture déclenchée — preview figé, thread en attente de lock")
     try:
         loop = asyncio.get_event_loop()
-        chemin = await loop.run_in_executor(None, camera.capturer)
+        try:
+            chemin = await asyncio.wait_for(
+                loop.run_in_executor(None, camera.capturer),
+                timeout=20.0
+            )
+        except asyncio.TimeoutError:
+            log.error("TIMEOUT capture DSLR après 20s — déconnexion forcée")
+            camera.deconnecter()
+            await diffuser_ws({"type": "camera_erreur", "message": "Timeout capture"})
+            return JSONResponse({"erreur": "Timeout capture — vérifiez le DSLR"}, status_code=500)
     finally:
         capture_en_cours = False
+    log.info(f"Capture terminée : {chemin}")
     if chemin is None:
         return JSONResponse({"erreur": "Echec capture"}, status_code=500)
     nom = chemin.name
diff --git a/frontend/css/style.css b/frontend/css/style.css
index 86baad9..d5ec3ab 100644
--- a/frontend/css/style.css
+++ b/frontend/css/style.css
@@ -402,6 +402,33 @@ html, body {
   100% { opacity: 0; }
 }
 
+.capture-en-cours {
+  position: absolute;
+  inset: 0;
+  display: flex;
+  flex-direction: column;
+  align-items: center;
+  justify-content: center;
+  gap: 1.5rem;
+  background: rgba(0,0,0,0.6);
+  z-index: 15;
+  font-size: 1.4rem;
+  color: #fff;
+}
+
+.capture-spinner {
+  width: 60px;
+  height: 60px;
+  border: 6px solid rgba(255,255,255,0.3);
+  border-top-color: #fff;
+  border-radius: 50%;
+  animation: spin 0.8s linear infinite;
+}
+
+@keyframes spin {
+  to { transform: rotate(360deg); }
+}
+
 .capture-info {
   position: absolute;
   bottom: 2rem;
diff --git a/frontend/index.html b/frontend/index.html
index 864f3cd..8548f07 100644
--- a/frontend/index.html
+++ b/frontend/index.html
@@ -97,6 +97,10 @@
         <span id="chiffre-car">3</span>
       </div>
       <div id="flash-blanc" class="flash-blanc cache"></div>
+      <div id="capture-en-cours" class="capture-en-cours cache">
+        <div class="capture-spinner"></div>
+        <span>Capture en cours...</span>
+      </div>
       <div class="capture-info">
         <span id="capture-compteur"></span>
       </div>
diff --git a/frontend/js/camera.js b/frontend/js/camera.js
index 19f53ae..be2d19c 100644
--- a/frontend/js/camera.js
+++ b/frontend/js/camera.js
@@ -11,6 +11,7 @@ const EMOJI_CAR = { 3: '🤪', 2: '😱', 1: '🔥' };
 
 function afficherErreurCapture(titre, detail = '') {
   arreterPreview();
+  document.getElementById('capture-en-cours')?.classList.add('cache');
   const el = document.getElementById('preview-erreur-camera');
   if (!el) { allerA('accueil'); return; }
   el.querySelector('p').textContent = titre;
@@ -129,9 +130,11 @@ async function lancerCapture() {
     if (captureAbortee) return;
 
     afficherFlash();
+    document.getElementById('capture-en-cours').classList.remove('cache');
 
     const promesseCapture = apiPost('/api/capturer').catch(() => null);
     let resultat = await promesseCapture;
+    document.getElementById('capture-en-cours').classList.add('cache');
     let erreurReseau = false;
 
     if (!resultat) {