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G'day Dave.
So with the eyepieces you have you have mags of 46x, 80x and 133x. With your aperture scope your theoretical visual mag maximum is 400x. ie a 3mm eyepiece. Unfortunately unless you have exceptional seeing you are unlikely use that small an eyepiece. However if you were to get a 2x barlow you will then have an additional 92x, 160x and 266x mag, which are all very useful magnifications.
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