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Hi Tony,
Keep in mind that "NO" zoom eyepiece at any setting within its focal length range, will equal the optical performance of a "high quality" fixed focal length eyepiece of the same focal length, as the zoom setting. However, optically the better quality zooms have narrowed the performance gap somewhat in recent years, particularly the shorter focal length zooms.
If you want the convenience of a zoom eyepiece they have a lot of merit. If you want the absolute best in optical quality stick with fixed focal length eyepieces.
Cheers,
John B
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