There isn’t a lot of differences between the old and new Mewlon250.
The new one comes with an integrated field flattener as standard whereas it was an optional extra on the old one; it pushed it from F/12 to F/10.
The new one has four spider veins where as the old Mewlon had 3 (6 spikes as opposed to 4). As far as I’m aware the focus motor in the secondary didn’t change but the new Mewlon has a port (RS-232?) for motor control via computer as opposed to just hand controller as well as fans in the back plate.
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