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William Optics Zenithstar 61 II APO with UniGuide guidescope We could sum up the William Optics Zenithstar 61 II APO refractor as tiny and serious or seriously tiny. It’s a small, portable instrument with a 61mm air-spaced, colour-corrected doublet lens, which definitely packs a punch, especially when used for astrophotography. Advertisement The main tube is white with a black clamping ring and focuser barrel, while a choice of ...