William Optics Newly Designed Bahtinov Mask Focusing Mask Compatible with Diameters 75-110mm

William Optics Newly Designed Bahtinov Mask Focusing Mask Compatible with Diameters 75-110mm By attaching this product to the front of a telescope or camera lens and adjusting it, you can accurately focus. The new design makes the spike diffraction about three times brighter than the conventional Bahtinov mask (according to WO research), and makes it much easier to adjust. [Mounting diameter range] 75-110mm *The mounting diameter is not the lens diameter but the diameter of the hood to be attached William Optics Newly designed Bahtinov mask by WilliamOptics By attaching this product to the front of a telescope or camera lens and adjusting it, you can accurately focus. The new design makes it extremely bright and easy to adjust, with light striations (spike diffraction) about three times brighter than conventional Bahtinov masks (according to WO research). [Mounting diameter range] 75-110mm *The mounting diameter is not the lens diameter but the outer diameter of the hood to be attached.