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9 Focal Length (mm) 1200 Secondary Diameter 48mm Secondary Obstruction (by diameter) 24% Secondary Obstruction by Area 6% Observational Info Dawes Limit 0
The filter box is foam lined for protection and shock absorption during handling
28") Diopter Adjustment Range: ±2 Twilight Factor: 22
Weighs 14lbs
objects will often still look sharp at low powers
Bahtinov Focus Mask - Celestron SCT Sport Optics 9 Focal Length (mm) 1200Bahtinov focus masks provide an ingenious way to easily focus your DSLR camera, webcam or CCD camera for astrophotography. The method is simple, very intuitive, and the device has universally been named after the inventor, Pavel Bahtinov. The mask works by creating a group of three diffraction spikes. Two of these generate a cross pattern, and the 3rd moves with your focus. You know you have achieved perfect focus when the 3rd diffraction spike is
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