Ok, thanks for that everyone.
I do not have a budget for a 150mm short tube and anything bigger than an AZ3.
How does the AZ3 handle a 120mm short tube achro? I see they are sold as complete sets together so I assume they are compatible.
Is there a big viewing difference between a 120mm f/5 and a 150mm f/5?
The 120mm may be better as I want something I can throw in the car on camping trips.
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