Having in the past actually owned a LX90 and a CPC
I would go with the LX90 based on my direct comparisons as follows:
- Optically the 2 OTA's are very close. I personally don't thing there is enough difference to choose.
- I found the Fork mechanicals and electronics on the LX90 to be more reliable
- I found both alignment and tracking on the LX90 to be much quicker and accurate. Sure my CPC said it could do 3 star alignments but it means absolutely nothing if it does not do so accurately and reliably every time. In comparison the LX90 just did the job very single time. Target in the eyepiece after every alignment.
The new owner of my LX90 carts it around everywhere with him and his family in his SUV and it never fails on him.
If you really want a Celestron OTA I would stay away from the CPC and go with one of the EQ mounts
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