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What is the "purpose".
For imaging I use and suggest the Powermates (2.5x and/or 5x).
For viewing with the refractors I use a Zeiss 2x (and the Zeiss orthos).
Having said that there is not a great deal to the eye in most of them. Try a few. I don't think any more than 2x/2.5x for visual use though.
I use the 5x for imaging only (and only with shorter scopes).
Gary
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