diff --git a/src/picam/picam.py b/src/picam/picam.py
index db78a5f..28f1800 100644
--- a/src/picam/picam.py
+++ b/src/picam/picam.py
@@ -1,16 +1,18 @@
 from utils.utils import round_resolution
 
+ROUND_MULTIPLES = (32, 16)
+
 class PiCam:
     def __init__(self, config: dict):
-        self.capture_resolution = round_resolution(config["capture_resolution"])
-        self.preview_resolution = round_resolution(config["preview_resolution"])
+        self.capture_resolution = round_resolution(config["capture_resolution"], ROUND_MULTIPLES)
+        self.preview_resolution = round_resolution(config["preview_resolution"], ROUND_MULTIPLES)
 
     def set_capture_resolution(self, resolution: "tuple[int, int]") -> None:
         """Set capture resolution for camera
 
         :param resolution: New resolution for camera captures
         """
-        rounded_resolution = round_resolution(resolution, (32, 16))
+        rounded_resolution = round_resolution(resolution, ROUND_MULTIPLES)
         self.capture_resolution = rounded_resolution
 
     def set_preview_resolution(self, resolution: "tuple[int, int]") -> None:
@@ -18,7 +20,7 @@ class PiCam:
 
         :param resolution: New resolution for camera preview
         """
-        rounded_resolution = round_resolution(resolution, (32, 16))
+        rounded_resolution = round_resolution(resolution, ROUND_MULTIPLES)
         self.preview_resolution = rounded_resolution
 
     def capture(self) -> bytearray: