William Optics New Adjustable Flat73A for Z73
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This dedicated 2" field flattener by William Optics is precisely engineered for full-frame imaging with their ZenithStar 73 Apo telescope.
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
Specifically designed for William Optics ZenithStar 73
Technical Specification
Parameter
Value
Back Focus
66.2 mm
Adjustable Distance
11.4 mm
Image Circle
≈ 43 mm
Lens Design
2 groups, 2 elements
Flattener Length
39.5 mm
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
