William Optics New Adjustable Flat73A for Z73
This dedicated 2" field flattener by William Optics is precisely engineered for full-frame imaging with their ZenithStar 73 Apo telescope.
Key Features:
Direct M63 male thread ensures a secure, threaded connection to the Z73 telescope.
➤ Camera-side connection: Male M48x0.75 thread allows attachment of Canon or Nikon DSLRs using a camera-specific M48 T-ring (sold separately).
➤ Provides the correct 55mm working distance when paired with a compatible T-ring.
➤ ?? Not compatible with smaller M42 T-thread rings.
➤ For cameras with shorter back-focus, additional spacers/adapters will be required.
➤ True 1:1 flattener – no focal length reduction.
➤ Built-in female M48x0.75 filter thread supports standard 2" filters (must be bidirectional since filter orientation faces the telescope).
➤ Integrated rotator mechanism eliminates the need for a separate camera rotator
Compatibility:
➤ Specifically designed for William Optics ZenithStar 73

TECHNICAL SPECIFICATION
+
Adjustable Distance
11.4 mm
Lens Design
2 groups, 2 elements
Rotator / Adapter Length
26 mm
Telescope Thread
M63 x 1 x 6 mm
Camera Thread (T-Mount)
M48 x 0.75 x 4 mm
Supported T-Mounts
Canon EF, RF / Nikon F, Z / Sony E / Pentax K / MFT / FUJI X
Camera Format Compatibility
Full Frame and larger
Weight
328.8 g / 0.72 lbs