Product Detail High quality optics start with each lens and/or mirror being hand selected so only the finest grade of optical glass is used StarBright XLT coatings provide maximized light transmission 25mm multi-coated eyepiece, 20mm eye relief, 50 deg FOV 1.25 star diagonal (except #31057) CG-4 German Equatorial Mount with setting circles and slow motion controls to accurately locate and track sky objects . The "Celestron Omni XLT ® 120 - Celestron 21090" is best product for you. We recommended Celestron Omni XLT ® 120 - Celestron 21090