Field Flatteners & Reducers

0.8x Focal Reduction for SharpStar 94EDPH Creates a Fast f/4.4 Optical System 4-Element Optical Design 50mm Corrected Image Circle Standard 55mm B...

Dual focal reduction: 0.5x native and 0.33x with included extension Adapts 2" focusers to T-mount (M42x0.75) cameras Includes a 20mm T-threaded ex...

Reduces focal ratio by a factor of 0.8x Triplet lens design with 3 elements in 3 groups Corrects field curvature for full-frame sensors Designed f...

Reduces focal ratio to a fast f/5 0.75x reduction factor for wider fields of view Triplet optical design provides field-flattening correction Stan...

0.75x Focal Reduction Reduces Focal Length to 311mm Creates a Fast f/5.1 Focal Ratio 44mm Full-Frame Image Circle Standard 55mm Back Focus Triplet...

0.76x focal reduction factor Designed for the ZWO FF80-APO Refractor Triplet optical design with one ED element Standard 55 mm back focus Integrat...

Reduces FF65 APO focal ratio to f/4.8 0.75x reduction factor for wider fields of view Standard 55mm back focus from the M48 thread Integrated M48x...

55mm back focus Works with f/5 to f/7 refractors Compatible with APS-C size cameras or smaller. Accepts 2" filters Optimized for refractors with...

Engineered for the Askar 140APO Triplet Refractor 1x Flattener Preserves Native f/7 Focal Ratio Corrects a 44mm Full-Frame Image Circle Standard 5...

Reduces telescope focal ratio to a faster f/5.44 Shortens 103APO focal length to 560.32mm for wider fields Triplet optical design provides field f...

0.76x reduction factor specifically for the Askar 80PHQ Reduces focal ratio from f/7.5 to a faster f/5.7 Creates a new focal length of 456mm Gener...

Converts 76EDPH to a fast f/4.5 focal ratio Produces a 44mm image circle for full-frame sensors Standard 55mm back focus for easy camera integrati...

Reduces focal length by a factor of 0.8x Designed for the William Optics Zenithstar 73 telescope Provides edge-to-edge flat field for full-frame s...

Adjustable reducer and field flattener for William Optics Z61 telescope Improves image sharpness and reduces distortion Description ...

Reduces EdgeHD 1400 focal ratio by a factor of 0.7x Custom 5-element optical design preserves flat-field imaging Provides a generous 146mm of back...

Nominal Focal Reduction Factor Designed Exclusively for Daystar Quark Filters Widens the True Field of View Increases Image Brightness for Promine...

0.33X Focal Reduction Factor Designed for the Daystar Combo Quark Filter Enables Full-Disk Solar Imaging with Small Sensors Reduces Exposure Times...

Reduces focal length by a factor of 0.6x for wider solar views Brightens the image for significantly shorter exposure times Integrated tilt mechan...

Unique telecompressor designed for visual use with binoviewers Based on the flat-field Alan Gee design by Roland Christen of AstroPhysics Enables ...

Reduces focal length by a factor of 0.8x for wider fields of view Engineered for refractors with focal ratios from f/5 to f/7 Provides 55mm (+/- 2...

1.0x focal correction factor Designed for the Svbony SV550 80F6 telescope 45mm fully illuminated image circle M63x1 telescope-side connection Prov...

0.8x Focal Reduction Factor Specifically designed for the SVBONY SV503 102ED Telescope Corrects for field curvature for flat, sharp stars 3-Elemen...

Reduces telescope focal length by a 0.5x factor Fits standard 1.25" eyepieces and accessories Threads on via standard M28.5x0.6 filter threads Ful...