William Optics FLAT 73A
Best optical accessory for astrophotographers seeking edge to edge image clarity.
This essential optical accessory ensures your astrophotography captures remain sharp from the center to the very edge of the frame. By correcting field curvature, it delivers a flat image plane that is critical for high-quality deep-sky imaging.
$229.00
at
Williamoptics
Who it's for
- Astrophotographers seeking a precise, hassle-free setup for various camera sensors.
- Wide-field imagers demanding professional-grade clarity in their deep-sky captures.
- Urban astronomers needing to easily incorporate light pollution or narrowband filters.
Who should skip it
- Photographers using full-frame cameras who require a larger corrected circle.
- Telescope owners looking for a universal flattener for their collection.
- Hobbyists prioritizing low entry costs over mechanical convenience.
Performance breakdown
Edge-to-edge sharpness
Eliminates field curvature for pinpoint stars across the entire sensor frame.
Sensor compatibility
Seamlessly handles both APS-C and full-frame sensors without vignetting issues.
Build quality
Robust construction ensures stability within complex, heavy imaging train setups.
Optical precision
Two-element design maintains high contrast and clarity for deep-sky imaging.
Integration ease
Standard threading makes connecting to Zenithstar 73 scopes straightforward and secure.
Back focus accuracy
Generous 66.2mm back focus provides ample room for various camera accessories.
Key Specs
Flattener Power
1.0x
Lens Type
2 Groups 2 Elements
Optical Length
65.5 mm
Back Focus
66.2 mm
Image Circle
43 mm
Telescope Thread
M63 x 1 x 6 mm
T-mount Thread
M48 x 0.75 x 4 mm
Camera Format
APS-C, Full Frame
Weight
328.8 g
Warranty
2 Years
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