silverhawk Δημοσιεύτηκε Νοέμβριος 18, 2014 Δημοσιεύτηκε Νοέμβριος 18, 2014 Ηigh quality filter for H-Alpha imaging, such as of the North America Nebula, Lagoon Nebula, ... With this filter you can even take images of these faint objects from urban areas! The filter permits only the red part of the spectrum around the H-Alpha line. All other wavelengths are blocked. As a result most of the artificial light pollution is blocked as well. High contrast images of H-II regions are thus attainable. Specifications: - 2" (M48x0.75) thread on both sides - maximized clear diameter - precisely polished and coated for an excellent image quality Τιμη 80 ευρω http://WWW.FeelTheCosmos.com
Προτεινόμενες αναρτήσεις