Optical barrel assembly, camera including the same, analyte detector including the same, and associated methods

An optical barrel assembly includes a barrel having an inner bottom surface and an inner lateral surface extending from the inner bottom surface, the inner bottom and lateral surfaces defining a cylindrical housing, and a first element surrounded by the inner lateral surface of the barrel, wherein an outer perimeter of the first element has a different shape than a perimeter defined by the cylindrical housing. 本发明涉及种光学筒组件，该光学筒组件包括：筒，其具有内底表面和从内底表面延伸的内侧表面，内底表面和内侧表面限定圆筒形壳体；以及第元件，其由筒的内侧表面包围，其中第元件的外周部的形状不同于由圆筒形壳体限定的周部的形状。