I agree with all of the above.
Visual, get the 2.5x. Imaging the 5x. In my case I do both, so ended up with both.
In the visual scene I tend to use the eyepiece rather than a Powermate and eyepiece, not sure why, but do. So............ I could live with just the 5x, and this is with scopes of about 1000mm - 1250mm focal length. In an SCT the 2.5x would be all I need.
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