Alstar Telescope Filter 1.25 Inch UHC (Ultra High Contrast) Filter | for Superb Views of the Orion, Lagoon, Swan and Other Extended Nebulae, Improve the Image Contrast Reduces Light Pollution
As many celestial objects, such as nebulae, radiate at other wavelengths, a considerable increase in contrast can be achieved by this. The background sky appears darker and all at once, faint details become visible.
1.25" filter thread, each Alstar Ultra High Contrast Filter is individually inspected and proudly inscribed with the percentage of light transmittance of the O-III and H-beta emission lines.
Can be used at both light-polluted and dark sky sites. Blocks the light from mercury and sodium-vapour lamps.
Many objects only first become visible at all when using an UHC filter. But also, highlights such as the Orion, Lagoon or Swan nebulae, show a whole new side to them.
Nebula filter for increasing contrast, also suitable for use with smaller telescopes.
Alstar Telescope Filter 2 Inch Narrowband NBPF Hydrogen-a 12nm Filter | Enhances the Contrast Between Object and Sky, Take Good Quality Images even under Urban Skies
SAR 725
Alstar Bahtinov Mask Focusing Mask for Telescopes - FM100mm for a Tube Outer Diameter (OD) from 105mm-150mm
SAR 84
Alstar 1.25" Color/Planetary Filter for Telescope - #82A Light Blue
SAR 84
Alstar 2" Moon Telescope Eyepiece Color Filter ND96-0.9 ND96-0.6 ND96-0.3 Kit - 13 Percent Transmission for Telescope Eyepiece Reduce Moon Surfaces Overall Brightness
SAR 0
