William Optics Adjustable Field Flattener 73A
Best precision optical accessory for dedicated wide field astrophotographers.
This essential optical component ensures a perfectly flat field for astrophotography without altering the telescope's focal length. It simplifies the imaging train by integrating an angle adjuster and providing a standard back focus distance for common camera setups.
$278.00
at
Telescopes.net
Who it's for
- Astrophotographers seeking a streamlined setup for perfect star shapes
- Imaging enthusiasts demanding sharp details from edge to edge
- Professional photographers using large-format dedicated astronomy cameras
Who should skip it
- Multi-scope owners looking for a universal corrective optic
- Backpackers or travelers prioritizing the lightest possible gear configuration
- Beginners who prefer a simple plug-and-play hardware experience
Performance breakdown
Field Flatness
Eliminates edge distortion for crisp, corner-to-corner star clarity.
Mechanical Integration
Direct M63 threading ensures a rock-solid, wobble-free connection.
Rotation Convenience
Built-in angle adjuster makes framing shots effortless without extra hardware.
Optical Integrity
Maintains native focal length for uncompromised, true-to-scope imaging performance.
Filter Versatility
Seamlessly accommodates 2-inch filters to boost contrast and detail.
Setup Simplicity
Standardized back focus makes achieving perfect sensor spacing straightforward.
Key Specs
Weight
319.78g
Compatibility
Zenithstar 73
Mount Interface
M63 Male Thread
Connection Interface
M48-0.75 T-ring
Magnification Factor
1.0x
Back Focus
66.2mm
Image Circle
43mm
Filter Compatibility
2-inch filters
Know before you buy
Still have a question?
Ask Metto anything about the William Optics Adjustable Field Flattener 73A before you decide.
