Astromania 1.25Inch Metal Collimating Cheshire Eyepiece Without Laser for Newtonian Reflector Telescope - Long Version - Bundle with - 1.25" Narrowband NBPF Hydrogen-a 12nm Filter

• Astrophotography under a light-polluted night sky can be difficult. the solution is an H-alpha filter. the Astromania H-alpha cut-off filter works to filter out a large part of this light pollution Allowing 12 nm bandwidth of light centered on a wavelength of 656 nm to pass through. 90 percent transmission at H-alpha line 656 nm. that means the filter also blocks the infamous stray light and light from mercury and sodium vapour lamps The Astromania H-aplha cut-off filter enhances the contrast between object and sky. allowing you to take good quality images even under urban skies Fits in 1.25 inch focusers and easy to use. simply cap the telescope. remove the diagonal and place the eyepiece directly in the focuser For aligning optics of Newtonian reflectors. Dobsonian reflectors and Schmidt-Cassegrain Telescopes