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My 10" Skywatcher has given me great service for 4 yrs, and I have
been amazed at how well it it holds it's collimation. I demonstrated
this to a sceptical friend by collapsing and extending it, [locking and unlocking the 3 screws each time] 12 times, and when I finished the
collimator's laser beam was still within the doughnut on the primary mirror.[ The collimator was of course removed during the demonstration].
The scope was visually useable with no obvious deterioration in image
quality straight after the demo.It Holds collimation much better
than my friends 12" truss Dob. It must be because the extension
mechanism is so solid.
raymo
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