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the 5cm F2 Topcor has a chrome finish on later models it has a black finish. The two versions of the lenses also look different in the placement and design of controls, so are very probably different internally as well, but I have no idea how different. My black finish later production ...
Computerized telescopes function by way of a motorized mount that controls the positioning of the telescope as it points toward the night sky. In a bid to reduce vibrations on the instrument itself, they often feature a hand-held control to avoid the physical touching of the telescope. They ca...