I have the SW 254BD on EQ6 pro and I needed to get an extra weight to balance the scope. If you are serious about astrophotography you will require a guidescope and an auto guider down the track. All this adds weight and I think you will need a NEQ6 pro to manage it. Other option is to go to a 200mm and get a HEQ5 but I would encourage you to think about future proofing incase you upgrade later.
Conclusion - Get EQ6 pro for that OTA.
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