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[APML] Celestron 11" SCT mirror shift



I was wondering if anyone has some experience with focus locks on SCT's
Hutech has released a focus lock for the Celestron C11 SCT and I was wondering if
this device would eliminate mirror shift? Or does the mirror shift exist between the 
mirror and the mirror bracket?  
  I have been unsuccessful in my attempts to focus on a guide star using my ST-4 and Lumicon GEG combination.
I was hoping to use my Vixen 102 guide scope that I use with my Tak FS-128 on the C11. 
I have purchased the IFocus Ocular from Software Bisque and a ST-4 focal reducer. Neither have helped with
enabling the ST-4 in locating the guide star. 
 I do want to add that the IFocus Ocular / ST-4 works great on the Vixen 102 guide scope.
 
Thanks, Joe.