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Every time an OTA comes off and goes back onto a mount it needs to be checked for collimation. SCT's hold collimation well but you need to check it regularly for high res imaging. Also you should check collimation with the camera in the scope. It might need a slight tweak to give really sharp views. Collimating an SCT is very simple and takes a few minutes on an out of focus star.
Seeing will also be a problem as well as optics being at ambient or near to it. You have to pick your nights and the scope should be thoroughly cooled. You'll know if the optics are not cooled as the diffraction rings will have a v in them.
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