Assuming that the rings come with a dovetail bar , either vixen or losmandy style then you should be good to start. Everything else you buy is designed around improving your images, or allowing you to image under different circumstances. Guide scope, autoguider, flattener, dew heater, battery pack, lp filter, auto focus system and software are some things off the top of my head that you may want eventually. The thing is though, when you start imaging you will notice imperfections and issues that need to be fixed , this is what drives the extra spending.
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