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This is a high-quality Antares 1.25 27mm Kellner eyepiece with focusable crosshairs (single) that is designed especially for scope alignment and tracking. To obtain razor-sharp focusing of the crosshairs, simply turn the upper part of the eyepiece. Focus markings on the eyepiece barrel facilitate consistent focusing from session to session, no matter what the sky conditions may be. This reticle focusing feature - rarely available in competing crosshair eyepieces - is a great advantage if your eyesight is not perfect.
Whether you want better Go-To alignment or more precise tracking, a crosshair eyepiece is essential. You can even combine this eyepiece with a barlow lens for higher power and more accurate alignment.