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The SW 80 x 400 you mention I presume is an Achromatic rather than APO scope. Not the best option for imaging due to it's inherent chroma. You would need any of the similar APO scopes in which case your budget would be very strained I suspect.
You may be able to pick up a cheaper guiding option through the 'For Sales' on here. They quite often arise as others upgrade or change their setups. Then save for a better APO later, you will still need a guiding function so it won't be a waste of money.
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