diff --git a/backend/camera.py b/backend/camera.py
index efd8149..3d25761 100644
--- a/backend/camera.py
+++ b/backend/camera.py
@@ -64,6 +64,7 @@ class Camera:
         self.webcam = None
         self.webcam_index = -1
         self._preview_webcam_fallback = None
+        self.preview_dslr_ok = True  # True si le dernier preview DSLR a reussi
 
     def connecter(self, source=None) -> bool:
         """Connecte la camera. source: 'gphoto2', 'webcam:0', 'webcam:2', etc."""
@@ -202,7 +203,9 @@ class Camera:
         elif self.mode == "gphoto2":
             data = self._preview_gphoto2()
             if data:
+                self.preview_dslr_ok = True
                 return data
+            self.preview_dslr_ok = False
             # Fallback webcam pour le preview si le DSLR ne supporte pas le live view
             if not self._preview_webcam_fallback:
                 self._init_preview_fallback()
diff --git a/backend/main.py b/backend/main.py
index 430fd9f..d86eb78 100644
--- a/backend/main.py
+++ b/backend/main.py
@@ -37,6 +37,7 @@ clients_ws: list[WebSocket] = []
 
 capture_en_cours = False
 _dslr_erreurs = 0
+_dernier_envoi_erreur_preview = 0.0  # timestamp du dernier camera_erreur envoye depuis le preview
 
 async def surveiller_dslr():
     """Verifie periodiquement si un DSLR est branche et bascule dessus."""
@@ -529,6 +530,8 @@ async def traiter_message_ws(msg: dict, ws: WebSocket):
     if type_msg == "ping":
         await ws.send_json({"type": "pong"})
     elif type_msg == "preview":
+        import time as _time
+        global _dernier_envoi_erreur_preview
         # Pendant une capture DSLR, utiliser directement la webcam fallback
         donnees = None
         if capture_en_cours and camera._preview_webcam_fallback:
@@ -541,6 +544,12 @@ async def traiter_message_ws(msg: dict, ws: WebSocket):
         if donnees:
             b64 = base64.b64encode(donnees).decode("ascii")
             await ws.send_json({"type": "preview", "image": f"data:image/jpeg;base64,{b64}"})
+        # Si le DSLR est cense etre connecte mais le preview echoue, signaler l'erreur
+        if camera.mode == "gphoto2" and not camera.preview_dslr_ok:
+            now = _time.monotonic()
+            if now - _dernier_envoi_erreur_preview > 5.0:
+                _dernier_envoi_erreur_preview = now
+                await ws.send_json({"type": "camera_erreur", "message": "Le DSLR ne repond pas au preview"})
 
 
 async def diffuser_ws(message: dict):
diff --git a/frontend/js/camera.js b/frontend/js/camera.js
index 3102161..3ec8811 100644
--- a/frontend/js/camera.js
+++ b/frontend/js/camera.js
@@ -9,11 +9,28 @@ const EMOJI_CAR = { 3: '🤪', 2: '😱', 1: '🔥' };
 
 // --- Preview live ---
 
+function afficherErreurCapture(message) {
+  const el = document.getElementById('preview-erreur-camera');
+  if (!el) { allerA('accueil'); return; }
+  el.querySelector('p').textContent = message;
+  el.querySelector('span').textContent = 'Retour dans 3 secondes...';
+  el.classList.remove('cache');
+  setTimeout(() => {
+    el.classList.add('cache');
+    allerA('accueil');
+  }, 3000);
+}
+
 function afficherErreurPreview(visible) {
   const el = document.getElementById('preview-erreur-camera');
   if (!el) return;
-  if (visible) el.classList.remove('cache');
-  else el.classList.add('cache');
+  if (visible) {
+    el.querySelector('p').textContent = 'Appareil photo deconnecte';
+    el.querySelector('span').textContent = 'Reconnexion en cours...';
+    el.classList.remove('cache');
+  } else {
+    el.classList.add('cache');
+  }
 }
 
 function resetPreviewTimeout() {
@@ -111,7 +128,10 @@ async function lancerCapture() {
     }
 
     if (resultat.erreur) {
-      allerA('accueil');
+      arreterPreview();
+      afficherErreurCapture(resultat.erreur === 'Limite de photos atteinte'
+        ? 'Limite de photos atteinte'
+        : 'Echec de la capture — verifier le DSLR');
       return;
     }