William Optics ZenithStar 71 Doublet ED Refractor A71A The William Optics ZenithStar 71mm ED Doublet Refractor is an amazingly portable and versatile telescope. Featuring the superb fit and finish William Optics customers have come to love this optical tube looks great mounted on any tripod or mount! Optically speaking the ZenithStar 71 delivers incredibly sharp images and from a mechanical perspective this telescope will absolutely impress. The William Optics Zenith Star 71 has extensive internal baffles to block all stray / off axis light. With a f/5.9 focal ratio this is a fast telescope more then capable of producing great astro photos. The exterior of the ZenithStar telescope is painted powder white with red CNC machined accents. A retractable dew shield is built onto the tube to deflect stray light and keep minor dew from developing on the lens of the telescope. Great for plane travel the ZenithStar is truly a portable telescope. Comes with a 2 Year William Optics Factory Warranty.