William Optics Zenithstar 61 F5.9 Space grey

The new William Optics ZenithStar 61 II has the same lens, a doublet lens with FPL-53 glass, giving the telescope an excellent colour correction. The telescope's focal point is 360 mm and f ratio is f / 5.9.

Focusing device is still a rack and pinion with a 2 inch accessory connection and an adaptor to 1.25 inch. You can focus accurately with the dual speed focus buttons. On the left button a small gadget from William himself, a temperature meter. Using an auto focus motor is optional.

Another smart extra on the ZenithStar 61 II is the Bahtinov mask incorporated in the cap. So you actually have a dust cap and Bahtinov mask in one. All made of aluminium and the mask of transparent plastic.

There are 2 types of flatteners on the market for the ZenithStar 61 II, that are a flattener (Flat61A and a flattener reducer (Flat61R), both adjustable to the correct distance so that the correct back focus can be achieved with a DSLR or ZWO camera. The Flat61R even turns the ZenithStar 61 into a very fast telescope thanks to the 0.8x reduction of the focal length, resulting in an F ratio of f / 4.72.

Specifications

Lens Diameter: 61mm

Focal length: 360mm

Speed: f5.9

Maximum meaningful magnification: 152x

Maximum resolution (arcsec / pixel): 1.9

Image circle: 43mm

Limit Magnitude: 11.63

Coatings: Others

Focuser type: Rack & Pinion

Focuser size: 2 inch

Focuser rotatable: No

Focuser fine adjustment: Yes 1 in 10

Type: Refractor

Type of optics: Apochromat doublet

Tube material: Aluminum

Tube weight: 2.2kg

Tube length: 245mm

In The Box

William Optics ZenithStar 61 II with R&P focusing device 2 inch

Carrying case soft material

Color handle

Vixen style dovetail in color

Telescope bracket