[VARIABLE APERTURE CONTROL] This adjustable mechanical iris diaphragm offers a aperture size from 4mm to 50mm, allowing you to adapt to different lighting scenarios with ease. [COMPACT AND FUNCTIONAL] With a slim profile of only 1mm in thickness, it integrates effortlessly into any microscopy or photography setup without compromising space or functionality. [BOKEH ENHANCEMENT WITH 11 BLADES] Enjoy the aesthetic benefits of a rounded aperture thanks to its 11 blades, which enhance the quality of background blur in photographs and create an appealing visual effect. [METAL BUILD FOR LONGEVITY] Made from robust stainless steel and aluminum alloy materials, this diaphragm is built to last and provides dependable performance for all your imaging needs.