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Old 24-12-2020, 08:06 PM
AstroApprentice (Jason)
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AstroApprentice is offline
 
Join Date: Dec 2015
Location: Melbourne, Australia
Posts: 349
210 v 250

I recently acquired an old model u-250S and still have an old u-210. As Colin said, the 250 is much bigger, but if you have a tip-in saddle like a Rayox, then that can help make mounting easier. Both Mewlons are relatively big and require time to acclimatise thus making them more effort than a small grab & go refractor. I don’t think the 250 is much more effort to set up than the 210. Plus collimation with the three pairs of screws on the 250 is much simpler than the 210 with three screws only. The motorised secondary on the 250 is also a big plus over the 210. IMO, the 210 definitely requires a motorised Crayford focuser on visual back due to issues associated with moving the primary mirror. I also have one on the 250 for automated focussing as the 250S motor controller can’t be connected to PC/ASCOM, but the newer 250 controllers can.
The 210 is good quality, but the 250 is an improved design. Both give great views, but in use to date, I prefer the 250.
I mount both on Losmandy G11 - with the 210 I can use a short CW shaft and less CWs.
You’re likely aware of the lengthy discussion on CN of these scopes:
https://www.cloudynights.com/topic/5...nd-mewlon-250/
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