Spectrum Off-Axis Glass Solar Filter 13.75" ID – ST1375GOA

Spectrum Off-Axis Glass Solar Filter 13.75" ID – ST1375GOA uses an off-axis aperture to reduce effective aperture while maintaining safe solar viewing. This design can help minimize daytime atmospheric turbulence and is a practical option for larger telescope tubes.

• Off-axis glass solar filter design
• Secure aluminum cell with thumb screw and felt padding
• Natural yellow-orange solar image
• Useful for solar eclipses, sunspots, and granulation

Fit note: Measure the outside diameter of your telescope tube and order the next larger filter size.