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Just be aware that most guidescopes are achromatic refractors and will produce CA. If used for imaging it is likely your colour rendition will be affected and fringing will be evident. There are some ED guidescopes appearing on the market, like the Skywatcher Evoguide 50mm, but so far they have not been converted successfully into imaging scopes due to lack of a useful focuser.
There are a few cost effective small (60mm) ED refractors, that use high quality FPL-53 objective glass, providing good colour correction: the WO Z61, the Astrotech ATED60, and the TS60 are three of these -all pretty much the same scope. They cost a little more than the budget guidescopes but can serve several purposes, as a guide scope, visual wide field, and imaging capable wide field corrected refractors; importantly they have focusers with good control and capacity.
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