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William Optics ZenithStar 61 mm f/5.9 APO Doublet Refractor Telescope - Gold Edition - A-Z61GD

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William Optics ZenithStar 61 mm APO Refractor - Gold

The ZenithStar 61 with the patented Bahtinov mask cover provides more portability and utility than any telescope ever offered by William Optics. Produces excellent sharp images for astrophotography or wildlife photography when working in conjunction with any DSLR. Useful in high power both visually and, with a large image circle, for lunar photography when paired with a separately available dedicated Field Flattener 61. The ZenithStar 61 is a great instrument you'll be able to appreciate for several years to come!

The objective lens uses FPL-53 glass which is a significant improvement over the older FPL-51 ED glass. ED and SD glass dispersion properties are critical to ascertain the general color correction. The abbe index is the number used to quantify the "partial dispersion" of a specific glass. FPL-53 glass features a partial dispersion that is so close to pure fluorite, which has the highest partial dispersion of any material at around 95 V, that it has been referred to as synthetic fluorite.

The most expensive glass material currently available, FPL-53 is top-of-the-line glass that allows William Optics designers to realize the finest color correction.

When you purchase a telescope from William Optics, you can be assured that your instrument was tested on their Interferometer. Furthermore, each telescope is individually star tested by William Optics professionals to guarantee the ultimate in optical quality.