I bought this article on ebay, at the beginning I was not sure of the quality that have rotten but after having received it looks amazing! Calita of the material it is great! and it is so compatible with my telescopes and eyepieces (40mm Celestron except, it seems too big to get in, okay everyone else was there between the prefection). I have not yet used for astronomical pictures (it's bad weather in those days), but for me to have them I will upload them here .. Ahhh una else, my place of delivery is Bolivia .. they are delivered without any problem! .. I am very glad I chose Seben .. I will surely buy other products.