2mm Telescope Focusing Bahtinov Mask Acrylic Focus Mask Plate 60 To 90mm for Astrophotography

Feature: 1. Wide Range of Applications: Works with all types of telescopes, mirrors, refractors, for Dobsonians, for Mak Cas and for SCT, all you need to do is measure your telescope tube size and choose the appropriate mask size. Specification: Item Type: Telescope Focus Mask Material: Acrylic Thickness: Approx. 2mm / 0.08in Color: As Pictures Shown Weight: Approx. 21g / 0.7oz The Outer Diameter Size Range of the Telescope Objective Lens Is Supported: Approx. 60-90mm / 2.4-3.5in (there is an error of 1-2mm in manual measurement). Package List: 1 x Bahtinov Mask3 x Mounting Accessories