WILLIAM OPTICS ZENITHSTAR 73 III APO
Explore the Skies with William Optics ZenithStar 73 APO III
Step into a world of precision astronomy with the William Optics ZenithStar 73 APO III, the ultimate tool for avid sky watchers and astrophotographers. This advanced apochromatic refractor is engineered with a premium air-spaced doublet lens that incorporates Ohara FPL-53 ED glass to produce exceptionally clear and vivid images with minimal chromatic aberration.
Its compact and robust design, highlighted by a beautifully machined aluminum body and an elegantly anodized finish available in red and gold, ensures both durability and portability. Ideal for capturing stunning wide-field astronomical images and for portable visual astronomy, the ZenithStar 73 combines superior optical performance with ease of use. It includes high-quality accessories such as a CNC machined carry handle, a precision Bahtinov mask for easy focusing, and a protective soft case for travel.
Perfect for both beginners and seasoned astronomers, the William Optics ZenithStar 73 APO III stands out as a versatile and reliable choice for exploring the cosmos.
REVIEW of WILLIAM OPTICS ZENITHSTAR 73 III APO 👇
Technical Specification 
Specification |
Details |
Lens Type |
Doublet Apochromatic Prime Lens |
Focal Length |
430 mm |
Diameter |
73 mm |
Aperture |
f/5.9 |
Image Circle |
45 mm |
Focuser |
2″ Rack & Pinion (R&P) Focuser, compatible with EAF |
Optional Flattener |
FLAT 73A 1.0x
FLAT 73R 0.8x
|
Adapters |
N/A |
Lens Material |
FPL-53 |
Camera Format Compatibility |
Full Frame and larger |
T-Mounts Supported |
Canon EF, RF
Nikon F, Z
Sony E
Pentax K
MFT (Micro Four Thirds)
FUJI X
|
Tube Length |
Adjustable, 330 mm – 420 mm |
OTA Weight |
2.83 kg (6.24 lbs) |
Total Weight |
Not available |