The aperture may vary from φ1mm to φ25mm, it can be adjusted by the lever；Generally used to control the diameter of a beam, its position and the clear aperture will directly affect the brightness, clarity and aberration of the entire optical system.
| The clear aperture may be adjusted continuously； |
| Black-steel spring blade； |
| Aluminum housing with black anodizing oxide coating； |
| To be mounted on 75mm-long post. |
