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The Esprit 80 I owned had very nice optics and a filter could be mounted inside the flattener adapter. The focuser lock had to be partly engaged in order to hold weight, though it was still easy to use in that fashion. Skywatcher Australia after sales service/warranty is decent if you do have any problems with the scope.
The Esprit 80 is good for APS-C; if you want to cover full frame you'd need to go up to an Esprit 100. I recall reading that the 100 did not have an internal mount for a filter.
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