diff --git a/core/camera/base_camera.py b/core/camera/base_camera.py
index acaea6b..56b92b1 100644
--- a/core/camera/base_camera.py
+++ b/core/camera/base_camera.py
@@ -5,6 +5,11 @@ class BaseCamera(ABC):
 	def __init__(self) -> None:
 		self.error_msg = None
 
+	@staticmethod
+	@abstractmethod
+	def detect() -> dict:
+		raise NotImplementedError
+
 	@abstractmethod
 	def connect(self, index: int | None = None) -> bool:
 		raise NotImplementedError
diff --git a/core/camera/gphoto_camera.py b/core/camera/gphoto_camera.py
index a6ceb2c..46b1f88 100644
--- a/core/camera/gphoto_camera.py
+++ b/core/camera/gphoto_camera.py
@@ -24,20 +24,21 @@ class GPhotoCamera(BaseCamera):
 		super().__init__()
 		self.camera = None
 		self.configs: List[dict] = []
-		self.camera_list = []
+		self.camera_index = 0
 
-	def detect(self) -> list:
-		self.camera_list.clear()
+	@staticmethod
+	def detect() -> dict:
 		cameras = gp.check_result(gp.gp_camera_autodetect()) # type: ignore
 		# cameras = gp.Camera().autodetect()
 		if not cameras or cameras.count() == 0:  # type: ignore
-			return []
+			return {}
 		
+		camera_list = {}
 		for i in range(cameras.count()):     # type: ignore
 			name = cameras.get_name(i)       # type: ignore
 			port = cameras.get_value(i)      # type: ignore
-			self.camera_list.append({"name": name, "port": port})
-		return self.camera_list
+			camera_list[i] = {"name": name, "port": port}
+		return camera_list
 	
 	def connect(self, index: int | None = None) -> bool:
 		self.error_msg = None
@@ -45,10 +46,12 @@ class GPhotoCamera(BaseCamera):
 		
 		try:
 			if index:
+				self.camera_index = index
+				camera_list = GPhotoCamera.detect()
 				port_info_list = gp.PortInfoList()
 				port_info_list.load()
 
-				port_address = self.camera_list[index]["port"]
+				port_address = camera_list[index]["port"]
 				port_index = port_info_list.lookup_path(port_address)
 		
 				self.camera.set_port_info(port_info_list[port_index])
diff --git a/core/camera/opencv_camera.py b/core/camera/opencv_camera.py
index a6a20b5..edcb678 100644
--- a/core/camera/opencv_camera.py
+++ b/core/camera/opencv_camera.py
@@ -5,7 +5,7 @@ from typing import List
 from .base_camera import BaseCamera
 
 
-class CvCamera(BaseCamera):
+class OpenCvCamera(BaseCamera):
 	"""Kamera oparta na cv2.VideoCapture"""
 
 	config_map = {
@@ -24,13 +24,28 @@ class CvCamera(BaseCamera):
 		self.camera_list = []
 		self.camera_index = 0
 
-	def detect(self) -> list:
-		self.camera_list.clear()
-		self.camera_list = enumerate_cameras(cv2.CAP_ANY)
+	@staticmethod
+	def detect():
+		camera_list = enumerate_cameras(cv2.CAP_ANY)
+		result = {}
+		seen_ports = set()
 
-		result = []
-		for camera in self.camera_list:
-			result.append({"name": camera.name, "port": camera.path})
+		for camera in camera_list:
+			# unikamy duplikatów tego samego /dev/videoX albo tej samej ścieżki na Windows/macOS
+			if camera.path in seen_ports:
+				continue
+
+			cap = cv2.VideoCapture(camera.index, camera.backend)  # próbujemy otworzyć
+			ret, frame = cap.read()
+			cap.release()
+
+			if ret and frame is not None and frame.size > 0:
+				result[camera.index] = {
+					"name": camera.name,
+					"port": camera.path,
+					"backend": camera.backend,
+				}
+				seen_ports.add(camera.path)
 
 		return result
 
@@ -38,7 +53,7 @@ class CvCamera(BaseCamera):
 		self.error_msg = None
 		try:
 			if index:
-				self.camera_index = self.camera_list[index].index
+				self.camera_index = index
 
 			self.cap = cv2.VideoCapture(self.camera_index)