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I am not sure you could use a RACI finder on its own. Could be frustrating to place objects in the finder FoV.
My solid tube Dob has both Telrad (excellent) and RACI finder (13X70). For faint objects I use the Telrad to place the correct star field in the RACI finder FoV and then use star patterns to place the desired object in the scope FoV.
My StringScope has a Rigel QuikFinder only. Not quite as nice to use as the Telrad but OK. I am having to relearn star hopping using a finder eyepiece with this scope. Great fun!!!
Cheers,
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