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I have the older star adventurer and have used that with a heavy 800mm or a 200mm as a travel mount.
The heavier lense is not ideal unless you spend a lot of time setting it up to prevent slip and get balanced but it can be done by adding additional counterweights. So i think the red cat would work at around 1.5kg for the scope. The limit of exposure is usually about 40 sec or less with good polar alignment so you are limited to the bigger brighter objects. These are also easier to find.
If you check cloudy nights there a lot of people using heavy lenses with star adventurers and additional weights and getting good results.
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