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Message: <blockquote data-quote="greg g" data-source="post: 1317469" data-attributes="member: 48764">The waterproof Williams Optics Swan 83 Doublet APO spotting scope, I had the opportunity to use and compare side by side with a Kowa 883 Prominar fluorite and a Swarovski 80 ATS HD.The Williams scope length (560mm) and weight(6.1 lb.) are a consideration.Zoom 25-75xBayonet endTwist-up eyecupEye Relief: 19.5mm(25X)-18mm(75X).Field of View 88.5-46.5ft/1000ydsAlso includes fixed eyepieces of 4mm, 7mm and 16mm.The Kowa 883 (500mm) & (3.4 lb, 4.1 lb) with an eyepiece.Zoom 20-60xBayonet endTwist-up eyecup.Eye Relief 17-16.5mmField of View 115-55 ft./1000 yds.Swarovski 80HD ATS (460mm) & (2.9 lb, 3.6 lb) w/eyepiece.Zoom 20-60xBayonet endTwist-up eyecup.Eye Relief 17 mm Field of View 108-60 ft./1000 yds.I am a fan of the Williams equipment that includes telescopes, barlows and eyepieces. This scope is half the price of the other two scopes, the Williams did not compare favorably with either of the other scopes in an artificial star test(fuzzy), length(too long) and weight(too heavy). The overall quality of the 83APO did not meet the same high standard in machining and did not have the attention to detail or quality control(loose rubber collar) as the other two scopes nor compared to other Williams scopes. One interesting surprise, the Williams 4mm eyepiece with the bayonet end fit into the Kowa scope. It did not engage, but worked.Greg</blockquote>