Quote:
Originally Posted by SkyWatcherMike
The first MN190's from SkyWatcher had the single speed crayford, which was not great for imaging.
This is still available from the factory, however Tasco import the version with what SkyWatcher call the Linear Power Focuser, this is an improved dual speed crayford.
Same design as the focusers on the F4 Carbon Fibre newts.
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if that's the case, then it will be OK for imaging with a light load. I fitted the SW focuser on my F4CF Newtonian with one of the original SharpSky kit stepper drives and it worked perfectly for a couple of years with a 1kg imaging train load. The main bearing eventually became a bit "gritty" ( I guess from dirt) so I swapped it out for a Moonlite as a preventative measure. Was still working OK though.
If it is the same design,
never unscrew the top ring and then loosen the tension screw - I did and found that there was nothing to stop the draw tube from falling into the OTA. Mine did just that and hit the secondary on the way down - leaving a small ding in the mirror coating
