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Hi, there is no reason why you cannot use a scope like this for narrowband work - as you have spotted CA will not matter (SA will though) and, as you point out, you will need to re-focus between filters and that will be a pain...these scopes typically do not come equipped for imaging - the focuser may be poor and have flex and/or image shift when locking. You will be tempted to upgrade and maybe automate the focuser - as you will be hanging quite a bit of weight on there - so perhaps it is better to consider a scope built for imaging. And yes you will need a flattener too (or to crop your images) and these are best matched to the scope and are sensitive to spacing - thus you may find issues with accommodation of the FW and or OAG while still getting the FR spacing spot on, check the dimensions/specs on all the components before you buy.
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