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It depends on what focal length you are using. For relatively wide field setups such as an ED80, a 50mm guidescope with an orion autoguider / QHY5 will be sufficient. For longer focal lengths, you will need either a longer length guidescope or an off axis guider setup. If you do go down the OAG path, you need a sensitive guider camera such as QHY5II, ASI or Lodestar.
Hope that helps
Bo
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