[CUSTOMIZABLE LIGHT CONTROL] Tailor the light entering your lens with an adjustable aperture range of 4mm to 50mm, perfect for achieving desired exposure levels in various lighting conditions. [SLIM DESIGN FOR EASE OF USE] At just 1mm thick, this mechanical iris diaphragm fits seamlessly into both camera and microscope setups, allowing for smooth adjustments without hindrance. [CREATES PLEASING BOKEH] The 11-blade design ensures a circular aperture even at lower settings, providing background blur and enhancing the artistic quality of your images. [RELIABLE AND STURDY MATERIALS] Constructed from stainless steel and aluminum alloy, this diaphragm withstands regular use while maintaining consistent performance over time.