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No - a long tube 150mm would be very unsafe. With the AZ3 I have tried a Orion ED80mm - works very well, an Orion ED100 mm- getting towards the limit but doable, a Skywatcher ED120 - no just very unsafe and unstable and a finally a short tube 150 /F5 - again really that is too much also and was unsafe.
I have read on a forum that some have done with a short tube 150 F/5 it but I would hate to see it tip over . It is the length / over hang of the tube really that makes it unstable on a AZ3. Some have used a 6in. SCT with reasonable results.
Chris
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