Variable Aperture Control

A precision-engineered accessory designed to continuously vary the aperture of a telescope's objective lense. Adjust to cut the marginal rays and allow only the paraxial rays to enhance spectroscopic performance in experiments of Resolving Power of prism and grating. It effectively controls the deapth of field and improves clarity. FEATURES: · Robust Circular Holder with 3-point fixing screws for stable mounting Integrated Iris Diaphragm for adjustable aperture control.