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
2 inch 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
The laser comes fully adjusted; It can be further adjusted if required; It has three openings for adjustment: arranged at 120 degree which are initially sealed; The battery can be exchanged by unscrewing the small screw cap at the rear of the laser
This adjustment tool can be used in all 1.25 inch focusers; We provide you with precise instructions in German and English with a step by step explanation of how to adjust a telescope using this laser unit; Even if you are a newcomer to amateur astronomy