Nel caso in cui questo articolo non fosse momentaneamente disponibile in magazzino, si prega di notare quanto segue: noi ordiniamo da questo fornitore ad intervalli regolari. Si prega di inserire il vostro ordine, in modo da poterlo prendere in considerazione e consegnarvi l'articolo entro la data di cui sopra.
Please note: This text was taken directly from the manufacturer.
The UltraBlock is the filter for deep-sky observers located at highly light-polluted sites. Blocks all forms of light pollution - mercury vapor and sodium emission bands - while passing the critical hydrogen-beta and ionized oxygen wavelengths. With an UltraBlock, emission and planetary nebulas "surface" from the washed out background sky. In dark skies, the UltraBlock also enhances the sky presence of a significant number of fainter deep-sky objects over unfiltered and wideband-filtered views.
