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A telrad and a rigel will both do the job. We have have a mix of both on our scopes. I would suggest that a Telrad is a little easier to use, the extra 4 degree field can be helpful if matching to charts and star hopping.
Both need to be aligned pretty much every time. The rigel uses a shorter lasting, harder to find battery.
As long as you can sight along it the Telrad will not need a riser.
TLDR; Rigel for small scopes, Telrad for everything else. You probably want a Telrad.
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