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Pentax eyepieces have increased in popularity over the past few years as more people experience the wide field of view, long eye relief and fully multi-coated lanthanum glass that provides a great observing experience through Pentax eyepieces. The Pentax eyepiece line-up features the Pentax XW eyepieces, while the secondary lines include the Pentax XO eyepieces and the Pentax XF eyepieces. The Pentax XW eyepieces feature a full 70 degree field of view and a comfortable 20mm of eye relief. The Pentax XO eyepieces are comprised of two Orthoscopic design eyepieces that are among the best high-power planetary eyepieces made. The Pentax XF eyepieces are a more economical choice for observers who want the Pentax quality at a great price.