William Optics FLAT 73A field flattener for Zenithstar 73 astrophotography
Roll over image to zoom in Click on image to zoom
William Optics FLAT 73A field flattener for Zenithstar 73 astrophotography

William Optics FLAT 73A Field Flattener

William OpticsSKU: P-FLAT73A
Price:
$384.00 CAD
Stock:
Qty: 1
  • Description
  • Specifications

The William Optics FLAT 73A is a 1.0x field flattener designed for compatible William Optics refractors, especially Zenithstar 73 imaging systems. It helps correct field curvature so astrophotographers can capture sharper stars from the centre to the edge of the frame.

Who Is This Product Best For?

Best for astrophotographers using a compatible William Optics refractor who want improved corner star performance without reducing focal length.

Why Choose This Product?

  • 1.0x correction: Keeps the telescope focal length unchanged.
  • Field flattening: Helps improve edge-to-edge star shape.
  • Imaging accessory: Designed for camera-based deep-sky astrophotography.

Recommended Uses

  • Zenithstar 73 astrophotography
  • Wide-field deep-sky imaging
  • Improving corner star sharpness

Compatibility and Accessory Notes

Confirm telescope compatibility, adapter requirements, and camera backfocus spacing before imaging.

Important Limitations

This is an imaging accessory and requires correct spacing for best results.

Our Recommendation

Choose the FLAT 73A if your compatible William Optics refractor needs field correction without focal reduction.

Product TypeField flattener
Reduction Factor1.0x
Primary CompatibilityZenithstar 73 and compatible William Optics refractors
Primary UseAstrophotography field correction
Important NoteCorrect backfocus spacing is required for best results

You may also like

Recently viewed

Recent Blog Posts

View all
Guide scope or off-axis guider: a PHD2 guide graph reporting 0.41 arcsecond RMS beside elongated stars from the same night

Your Guide Graph Is Lying to You

astrophotography Stephen Mallia
You drove ninety minutes to dark sky, PHD2 held 0.4 arcseconds all night, and half your subs still have eggs for stars. Here are the three things your

Read More
V-size Vixen and D-size Losmandy dovetail bar profiles compared to scale, about 44 mm against 75 to 84 mm

D-Size vs V-Size: A Complete Guide to Telescope Dovetail Systems

Stephen Mallia
What's the difference between D-size and V-size telescope dovetails? Here's everything you need to know.

Read More
A 55 mm back focus imaging train: spacer 16.5 mm, filter drawer 21 mm and camera sensor depth 17.5 mm, measured from the rear of the reducer

What Is Back Focus in Astrophotography? Telescope Reducers, Flatteners, and Spacing Explained

Stephen Mallia
What Is Back Focus in Astrophotography? Telescope Reducers, Flatteners, and Spacing Explained Back focus is one of those astrophotography terms that c

Read More