Astronomy Specialist

ZENITHSTAR 61 II F/5.9 APO DOUBLET

0

$999.00

Color
Gold
Red
Quantity
- +

 

The William Optics ZenithStar 61 II is a two element apochromatic refractor with a focal ratio of f/5.9 and a focal length of 360mm. Utilizing FPL-53 synthetic fluorite glass, this telescope provides excellent aberration correction.

The 2" 10:1 rack & pinion focuser is smooth, stable and reliable, providing no slippage over long imaging sessions. The new CNC-machined and anodized Cat handle bar with Vixen-style saddle is perfect for attaching a guide scope or other accessories. The ZenithStar 61 II also includes William Optics' innovative clear Bahtinov mask integrated into the lens cap.

For best imaging results, it is recommended to pair the ZenithStar 61 II with its matching Flat61A field flattener or the Flat61R 0.8x reducer.

 

William Optics ZenithStar 61 test report

 

Optical design

Apochromatic doublet

Objective diameter

61 mm

Focal length

360 mm

Focal ratio

f/5.9

Image circle

43 mm (with Flat61A field flattener)

Compatible flattener

William Optics Flat61A, Flat61R

Mount attachment

210 mm Vixen-style/Arca-Swiss dovetail bar

Focuser

Rack & pinion dual speed (10:1) 2" diameter

Camera connection

M54 x 0.75, 2"

Backfocus

67.9 mm (with flattener/reducer)

Tube weight

2.2 kg (including accessories)

Tube length

245 mm (fully retracted), 315 mm (fully extended)

Tube diameter

75 mm

Dew shield diameter

80 mm

SKU

WO-A-Z61IIGD (Gold), WO-A-Z61IIRD (Red)

 

William Optics ZenithStar 61 backfocus

 

  • ZenithStar 61 II
  • Lens cap with Bahtinov mask
  • CAT saddle handle bar
  • 210 mm Vixen-style dovetail bar
  • M54 to 2" adapter
  • 2" to 1.25" adapter
  • Soft carry case
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