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Message: <blockquote data-quote="forent" data-source="post: 1493185" data-attributes="member: 69540">Hi Kevin,thanks for your reply! But the MC30x and the DS30x are different constructions whereas all other MC eyepieces have optically identical DS counterparts. I wrote to Nikon Germany and that's what they told me:"Es ist in der Tat so, dass wir es nicht empfehlen das MC 24/30x an das ED 50/50A anzuschliessen. Grundsaetzlich ist der Anschluß moeglich, jedoch passt dieses nicht exakt auf das ED 50/50A, dies ist durch den Aufbau des Okulars so."My stumbling english translation: "Actually, we do not recommend to combine the MC 24/30x with the ED50/50A. Although the connection is possible in principle, the eyepiece does not fit exactly the ED 50/50A for reasons of the eyepiece construction."Well, that sounds to me as if the combination is possible mechanically but optically inferior. I don't think of any mechanical problems because the eyepiece does not protrude very far into the fieldscope socket. I will examine the optical performance of my three eyepieces more precisely in the next days.Best regards, Walther</blockquote>