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Old 15-05-2019, 10:19 AM
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The_bluester (Paul)
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The_bluester is offline
 
Join Date: Feb 2011
Location: Kilmore, Australia
Posts: 3,365
If it was not for the curvature and off axis coma I would have seriously thought about locking my C925 mirror permanently in a suitable position and fitting an external focuser, even using SGP for automated focusing with the focus motor is is a bit of a challenge to get really consistent results. I am happy that at least the results are as good as I am likely to get doing manual focus and SGP can refocus as often as once per sub all night if I want it to.

Jeremy, it probably really coms down to how good the focuser on your particular scope is. Mine I would say is middle of the road, not great but not bad and I could really see the benefit of mirror locks and an external focuser (Not being an Edge I dont get mirror locks) but if yours is good in the focuser you might not be able to justify it.

The only disadvantage I can see to the mirror locks on the Edge would be that for unattended imaging you either need to have a focus motor fitted to the stock focuser (The Edge will shrink and expand with temperature just like anything else) so you can't use the locks, or you need to rough focus it, lock the mirror and use an external focuser to deal with the temperature changes.
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