Sorry guys, can't help myself. I have a 12" Classic and thought it was the last generation without mirror lock. The GPS model does have the lock feature, and I thought all subsequent SCTs had it. I remember Jason Ware's posts including mention of his LX850 having the mirror lock.
Why would Meade abandon this? Or am I missing something fundamental, and a version of this feature is still there?
I had the temp compensation disabled while doing the focus runs and you can see those focus points in the data but then I factored in temp comp to do the graph. In the data you will see one column for actual focus reading and another for compensated readings. I am now convinced that my primary mirror is moving and that's why I see the large spread as I move the telescope around the sky.
I believe that Meade thought the newly designed focus mechanism (dubbed as Crayford like) would not need a lock but they are finding out now that it does. Seems like something that should have been tested before marketing.
Please post your dealing with meade as I have the same scope but no camera to test it.
Upon my conversation with them they are insinuating that this must be a problem with your particular OTA and not the design as a whole.
I am very skeptical of this but want to give meade the benefit of a doubt.
As I have stated I bought my scope for AP but cannot afford the camera for a good year yet. If my mirror moves there is no way I will be able to get the results a high end instrument (which this is supposed to be)should give. Visually I haven't noticed focusing all that often.
Maybe there is a retrofit lock that Meade will offer to fix this. I would be fine with anything that works.
Yes, I also am somewhat skeptical of FocusMax sometimes and so in this instance I was also watching the very dim backgound stars to reaffirm my focus point. I agree about "jumping the gun" and would not presume to say this focus shift will be present on all LX850s. Hopefully not! I can only testify to my own problem.