William Optics ZenithStar 61mm APO Refractor with Cat Handle Bar - Space Gray

William Optics ZenithStar 61 mm APO Refractor - Space Gray

This 61mm Zenithstar Refractor from William Optics comes with two fantastic accessories! When you purchase this OTA, you also get the William Optics Cat Series handle bar and a 210mm dovetail plate, each anodized to match the space gray color accents on the telescope.

The William Optics ZenithStar 61 uses FPL-53 glass to help produce excellent sharp images for astrophotography or wildlife photography when working in conjunction with any DSLR. This refracting APO telescope is useful in high power both visually and, with a large image circle, for lunar photography when paired with a dedicated Field Flattener R61 (not included). The powerful performance is delivered in an incredibly portable telescope system!

When it comes to the FPL-53 glass, the objective lens' 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.

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

About the Cat Series Handle Bar

When paired with the included Z61 mounting rings, this Vixen style handle bar is a great way to carry your light weight refractor around. It also accepts Vixen style dovetails for guide scopes and guide rings. William Optics' 50mm guiding ring and the WO 50mm Uniguide guide scope (both not included) are compatible with the handle.

About the 210 mm Dovetail Plate

The William Optics DSD 210mm (8.27") dovetail plate has both a Vixen and Arca Swiss size at each end of the plate. The plate has two 1/4-20 threaded holes. The dovetail plate is the perfect accessory to help you mount your Z61 telescope for imaging sessions and visual observations.

Zenithstar 61mm APO Refractor Specifications

• Focal Length: 360mm

• Aperture: 61mm

• Focal Ratio: f/5.9

• Focuser: 2" Rack & Pinion Focuser

• Image Circle: > Full Frame

• OTA Length (Fully Retracted): 230mm

• OTA Length (Fully Extended): 300mm

• OTA Weight: 3.2 lb. (1.45 kg)

• Color: Powder white with Space Gray Accents