Astronomy Specialist

ZENITHSTAR 73 III F/5.9 APO DOUBLET

$1,199.00

Color
Gold
Red
Quantity
- +

 

The William Optics ZenithStar 73 III is a two element apochromatic refractor with a focal ratio of f/5.9 and a focal length of 430mm. Utilizing FPL-53 synthetic fluorite glass, this telescope provides excellent aberration correction.

The 2.5" 10:1 rack & pinion focuser is smooth, stable and reliable, providing no slippage over long imaging sessions. The new CNC-machined and anodized handle bar with Vixen-style saddle is perfect for attaching a guide scope or other accessories. The ZenithStar 73 III also includes William Optics' innovative clear Bahtinov mask integrated into the lens cap.

For best imaging results, it is recommended to pair the ZenithStar 73 III with its matching Flat73A field flattener or the Flat73R 0.8x reducer.

 


 

Optical design

Apochromatic doublet

Objective diameter

73 mm

Focal length

430 mm

Focal ratio

f/5.9

Image circle

43 mm (with Flat73A field flattener)

Compatible flattener

William Optics FLAT73A, FLAT73R

Mount attachment

210 mm Vixen-style/Arca-Swiss dovetail bar

Focuser

Rack & pinion dual speed (10:1) 2.5" diameter

Camera connection

M63 x 1, 2"

Backfocus

66.2 mm (with flattener/reducer)

Tube weight

2.83 kg (including accessories)

Tube length

330 mm (fully retracted), 420 mm (fully extended)

Tube diameter

TBD

Dew shield diameter

TBD

SKU

WO-A-Z73IIIGD (Gold), WO-A-Z73IIIRD (Red)

 

William Optics ZenithStar 73 III backfocus William Optics ZenithStar 73 III backfocus with FLAT73A William Optics ZenithStar 73 III backfocus with FLAT73R

 

  • ZenithStar 73 III
  • Lens cap with Bahtinov mask
  • Vixen-style saddle handle bar
  • 210 mm Vixen-style dovetail bar
  • Soft carry case

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