SplashNColor Bahtinov Focusing Mask Compatible with Starfire 130 EDT Telescope – Precision Star Focus Aid | Friction Fit Diffraction Pattern Cap | Astrophotography Accessory for Sharp

["PRECISION STAR FOCUSING — Engineered slit pattern generates a clear three-spike diffraction image in your eyepiece or camera live view, letting you dial in critical focus on any bright star in seconds rather than guessing by eye","CUSTOM FIT FOR 130 EDT REFRACTOR — Designed to slip snugly over the dew shield opening with a firm friction fit that holds securely during focusing sessions yet removes easily when you are ready to begin your imaging run","DURABLE ALL-WEATHER CONSTRUCTION — Built from rigid, impact-resistant ABS that withstands cold observatory nights, damp conditions, and repeated field use without warping, cracking, or losing its precise slit geometry over time","ASTROPHOTOGRAPHY ESSENTIAL — Eliminates the frustration of soft frames by giving you a definitive visual indicator of perfect focus before you commit to long-exposure deep sky, lunar, or planetary imaging sessions","SIMPLE SLIP-ON DESIGN — No tools, adapters, or modifications needed to mount or remove the mask from your telescope tube, so you spend less time fiddling with gear and more time capturing photons under dark skies"]