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12.5mm plossl eyepiece with an illuminated double crossline reticle; excellent for accurate polar alignment and acquiring and centering of guide stars for guided astrophotography pursuits Multi coated lens and 4 elements plossl design for excellent color correction and sharp image 40 degree apparent field of view makes acquiring and centering target objects a breeze; 11 mm comfortable eye relief for comfortable long time viewing without tired Standard 1.25" eyepiece; suitable for any standard 1.25" telescopes filters and other astronomical devices; inside threaded design can well decrease the reflection of internal stray light Adjustable brightness; led illuminated double cross line reticle has adjustable focus and brightness