Ciwanning Adjustable Diaphragm Aperture 1.5–26mm, 45mm OD, M30 to M37 — For Camera & Optical Systems

Construction & materials: Precision diaphragm built from aluminum alloy and steel for long-lasting strength and reliable performance. Dimensions & compatibility: Outer diameter 45mm with an adjustable iris opening from 1.5mm to 26mm; fits M30 to M37 mounting sizes. Function: Provides a variable small aperture to control light transmission in optical setups such as cameras, microscopes and related equipment. Operation: Manual handle lets you quickly and directly change the aperture diameter for fast adjustments. Advantages: Lightweight design that won’t noticeably add mass to your system, with good mechanical strength, rust resistance and stable operation.