Skip to content

ZWO Cameras 10% Off!

Field Flatteners

Items 1 - 25 of 54

Baader Planetarium Fluorite Flat Field Converter - FFC

SKU: BAD-FFC
  • For multiple telescope designs, produces a flat field over 90 mm image circle!
  • Four element Fluorite Flat Field Converter is a diffraction-limited APO
  • Fluorite design eliminates chromatic aberration
  • Covers up to a 6 cm x 7 cm format at up to 8X magnification
  • Works equally well with Newtonian, Schmidt-Cassegrain, Ritchey-Chretien and APO refractor telescopes
Free shipping Free shipping
$869.00

Stellarvue Large Field Flattener with 48 mm Threads for f/7 Refractors & 3" Feather Touch Focusers - SFF3-3FT-48

SKU: STV-SFF3-3FT-48
  • Designed especially for Stellarvue f/7 refractors with 3" Feather Touch focusers, as well as for cameras using larger sensors.
  • This Stellarvue Photographic Field Flattener is suitable for use with wide 48 mm T-ring threaded DSLR cameras.
  • Threads onto the back of 3" FeatherTouch focusers.
  • Requires the standard DSLR back focus of 55 mm.
$269.00

Stellarvue Large Field Flattener with 42mm Threads for f/7 Refractors with 2.5" Focusers - SFF3-25-42

SKU: STV-SFF3-25-42
  • Optimized for use with 2.5” Stellarvue and FeatherTouch focusers, as well as cameras with large chips.
  • This Stellarvue Large Photographic Field Flattener fits DSLR camera with M42 T-ring threads.
  • Threads into the back of 2.5” focusers.
  • Made to be used with Stellarvue f/7 refractor telescopes.
$269.00

Stellarvue Large Field Flattener with 48 mm Threads for f/7 Refractors with 2.5" Focusers - SFF3-25-48

SKU: STV-SFF3-25-48
  • Made for large chip cameras and 2.5" focusers, this Stellarvue Large Photographic Field Flattener contains 48 mm threads.
  • Compatible with DSLR cameras featuring wide M48 T-ring threads.
  • Attaches to the rear of both 2.5" Stellarvue and 2.5" FeatherTouch focusers.
  • Designed for use with Stellarvue f/7 refractor telescopes.
$249.00

Stellarvue Large Field Flattener with 42 mm Threads for f/7 Refractors with 3" Feather Touch Focusers - SFF3-3FT-42

SKU: STV-SFF3-3FT-42
  • This Stellarvue Large Photographic Field Flattener is optimized for use with Stellarvue f/7 refractor telescopes using 3" Feather Touch focusers.
  • Fits digital SLR cameras with standard 42 mm T-ring threads.
  • Attaches to the rear of the 3" Feather Touch focuser.
  • Requires the standard DSLR back focus of 55 mm.
$269.00

Stellarvue 2" Photographic Field Flattener for f/6 Telescopes - SFF6

SKU: STV-SFF6
  • This Stellarvue Field Flattener can be used on STV f/6 refractors with 2" focusers
  • Works with focal lengths from 480 mm - 700 mm
  • Telescope side has 2" barrel that plugs into the focuser
  • Camera side accepts M42 adapter or photographic T-ring for your DSLR
$195.00

Stellarvue Photographic Field Flattener For f/7 Telescopes & DSLR Cameras - SFF7-21

SKU: STV-SFF7-21
  • Stellarvue SV80, SV102, and SV110, as well as all other Stellarvue telescopes operating at a specific focal ratio, are compatible with this Stellarvue Photographic Field Flattener.
  • Includes an t-thread adapter with 55-56 mm spacing distance for DSLR cameras.
  • Designed to be used with cameras incorporating an APS-sized or smaller sensor chip.
  • This Stellarvue Field Flattener contains standard M42x0.75 t-threads.
$195.00
Stellarvue Photographic Field Flattener for f/7 Telescopes with 2.5" Focusers & DSLR Cameras

Stellarvue Photographic Field Flattener For f/7 Telescopes w/ 2.5" Focusers & DSLR Cameras - SFF7-25

SKU: STV-SFF7-25
  • This Stellarvue Photographic Field Flattener has been optimized for use with 2.5" Stellarvue and Feather Touch focusers.
  • Compatible with SV80, SV102, SV110, and any other Stellarvue telescope functioning at a certain focal ratio.
  • Includes an t-thread adapter with 55-56 mm spacing distance for DSLR cameras.
  • Designed to be used with cameras incorporating an APS-sized or smaller sensor chip.
$229.00
Stellarvue Photographic Field Flattener for f/7 Telescoeps with 3" Feather Touch Focuser & DSLR Camera

Stellarvue Photographic Field Flattener For f/7 Telescopes w/ 3" Feather Touch Focusers & DSLR Cameras - SFF7-3FT

SKU: STV-SFF7-3FT
  • Stellarvue SV80, SV102, and SV110, as well as all other Stellarvue telescopes operating at a specific focal ratio, are compatible with this Stellarvue Photographic Field Flattener.
  • Made especially for use with the 3" Feather Touch Focuser.
  • Includes an t-thread adapter with 55-56 mm spacing distance for DSLR cameras.
  • Optimized for cameras featuring a sensor chip APS-sized or smaller.
$239.00

Takahashi FC/FS Multi Flattener 1.04x - TKA00582

SKU: TAK-TKA00582
  • This flattener from Takahashi is made as a universal replacement for FS/FC flatteners.
  • Takahashi has designed the 1.04x flattener to work only with the FS and FC telescopes.
  • The flattener helps correct spherical aberration.
  • Takahashi's field flattener uses a two element design.
$233.00
Explore Scientific ED APO Field Flattener Lens

Explore Scientific 2" Field Flattener for APS-C Cameras - FFEDAPO-01

SKU: EXS-FFEDAPO-01
  • Flatten the field for astrophotography with this field flattener
  • Designed for use with APS-C & smaller sensors
  • Telescope side is a 2" barrel
  • Camera side has M42 T-threads
  • 55 mm of back focus
  • Will not provide flat field when used with full-frame cameras
$199.99 $169.99
Hotech 2" SCA Self-Centering Field Flattener

Hotech 2" SCA Self-Centering Field Flattener - SCA-FFT58

SKU: HTC-SCA-FFT58
  • Fully multi-coated Hotech 2" Field Flattener with two-element lens and integrated self-centering adapter.
  • Provides maximum light transmission without compromising your telescope's light gathering capability.
  • Compatible with refractors that have between f/5 and f/8 focal ratios.
  • Eliminates drawtube and visual back slop, as well as unstable thumbscrew or unified compression ring locking.
  • Enhances image capture stability by dampening unwanted telescope vibrations.
  • The camera side accepts standard 42 mm threaded T-rings.
$245.00 $160.00
iOptron 2-inch Field Flattener

iOptron 2" Field Flattener for f/5 - f/7 Refractors - TFF

SKU: IOP-TFF
  • This iOptron 2" Field Flattener is optimized for refractor telescopes with f/5 to f/7 focal ratios.
  • Generates clear, well-defined images over the entire view field.
  • Features a fully multi-coated two-element optical design with Ohara S-BLS7 glass.
  • The iOptron 2" Field Flattener offers both durability and exterior beauty with machined aluminum construction and an anodized gloss finish.
  • Built-in T-ring thread accepts the majority of 35 mm cameras.
Free shipping Free shipping
$220.00

Sky-Watcher 0.85X Reducer/Corrector for Pro 100ED Telescope - S20201

SKU: SKY-S20201
  • Optimized for Sky-Watcher Pro 100ED apochromatic refractor telescopes, the SkyWatcher 0.85x Focal Reducer/Corrector enables faster optics for improved astrophotography performance.
  • Reduces the focal ratio of 100 mm Pro ED APO refractors from f/9 to f/7.56.
  • In addition to lowering the 100 mm Pro ED's effective focal length, this accessory also improves field-edge correction considerably.
  • Works best in conjunction with Sky-Watcher M48 T-ring adapters.
Free shipping Free shipping
$249.00

Sky-Watcher 0.85X Reducer/Corrector for Pro 120ED Telescope - S20202

SKU: SKY-S20202
  • This SkyWatcher 0.85x Focal Reducer/Corrector is designed for those who wish to bolster their Sky-Watcher Pro 120ED APO refractor's astro-imaging capabilities.
  • Reduces the focal ratio of 100 mm Pro ED APO refractors from f/7.5 to f/6.3
  • Provides effective focal length reduction by a factor of 0.85x while greatly improving field-edge correction.
  • Works best in conjunction with Sky-Watcher M48 T-ring adapters.
Free shipping Free shipping
$249.00
Stellarvue 0.72 Focal Reducer & Field Flattener for SVA130T 3" Feather Touch Focuser with 48 mm Camera Adapter

Stellarvue .72 Reducer/Flattener for SVA130T-3FT with 48 mm Camera Adapter - SFFR72-130-3FT-48

SKU: STV-SFFR72-130-3FT-48
  • Stellarvue 0.72x Focal Reducer and Field Flattener expressly designed for Stellarvue SVA130T refractor telescopes with 3" Feather Touch focuser.
  • Converts the Stellarvue 130 mm f/7 refractor into a faster f/5 instrument for wide field imaging.
  • Offers 55 mm of backfocus with 48 mm male camera thread using supplied adapters.
  • Best suited for full frame DSLR camers with larger 48 mm t-rings.
Free shipping Free shipping
$695.00
Orion Field Flattener for Short Refractors

Orion Field Flattener for Short Refractors - 08893

SKU: ORI-08893
  • For short refractor telescopes with fast optics, this convenient fully multi-coated 38 mm clear aperture Orion Field Flattener eliminates field curvature.
  • Works with refractors that have focal lengths between 400 mm and 660 mm, and focal ratios between f/5 and f/7.5.
  • This Orion Field Flattener makes your fast refractor better suited for astrophotography, thereby unlocking its full potential.
  • Flattens the field of view while maintaining the focal length attributes of your short refractor.
  • Suitable for use with 2" focusers, this Orion Field Flattener requires a back focus of 55 mm.
$139.99
Stellarvue SV70T Focal Reducer and Field Flattener

Stellarvue SV70T Focal Reducer and Field Flattener - SFFR-70APO

SKU: STV-SFFR-70APO
  • Stellarvue Focal Reducer and Field Flattener for the SV70T APO Triplet Refractor.
  • Converts the effective focal length of the Stellarvue SV70T from 420 mm (f/6) to 336 mm (f/4.8).
  • Standard M48 thread permits the addition of 2" filters for imaging.
  • 55 mm back focus for DSLR imaging increases to 66 mm with the removal of the included 11 mm extension tube.
  • Optional 42 mm spacers are available for obtaining the appropriate back focus distance for your CCD camera.
Free shipping Free shipping
$179.00
Stellarvue 2" Field Flattener Reducer for SV80 with 2.5" Focusers

Stellarvue SV80 2" Flattener 0.8X Reducer for Access 80 - SFFR80-25

SKU: STV-SFFR80-25
  • This Stellarvue 2" Field Flattener and Focal Reducer provides 0.8x reduction for older SV80ED and current 80 mm Access refractor telescopes.
  • Offers a secure connection between the camera with t-ring installed and focuser with no thumbscrews required.
  • Features 55 mm of backfocus to match that of a DSLR camera with appropriate t-ring.
  • Not suitable for use with SV80 triplet refractors made from 2018 to the present.
$189.00
Stellarvue 2" Field Flattener Reducer for SV102 with 2" Focusers

Stellarvue SV102 2" Flattener 0.8X Reducer for 2" Focusers - SFFR102-2

SKU: STV-SFFR102-2
  • Combining a 2" Field Flattener and 0.8x Focal Reducer, the Stellarvue SFFR102-2 is optimally suited for use with Stellarvue SV102T triplet refractor telescopes.
  • Enables faster optics by allowing f/7 telescopes to operate at a f/5.6 focal ratio.
  • Fits the Stellarvue 102 mm f/7 Triplet's 2" focuser.
  • The SFFR102-2 has 55 mm of back focus, identical to that of a DSLR camera with appropriate t-ring.
$195.00

Stellarvue SV102 2" Flattener 0.8X Reducer for 2.5" Focusers - SFFR102-25

SKU: STV-SFFR102-25
  • The Stellarvue SFFR102-25 is a combination 2" Field Flattener and 0.8x Focal Redcuer optimized for use with Stellarvue SVR102T refractor telescopes.
  • Converts the f/7 SVR102T with 714 mm focal length into a faster f/5.6 instrument with 571 mm focal length.
  • Compatible with the 2.5" Stellarvue or Feather Touch focuser featured on the Stellarvue SVR102T.
  • The SFFR102-25 has 55 mm of back focus, identical to that of a DSLR camera with appropriate t-ring.
$199.00
Stellarvue 2" Field Flattener Reducer for SV102T with 3" FT Focusers

Stellarvue SV102 2" Flattener 0.8X Reducer for 3" FT Focusers - SFFR102-3FT

SKU: STV-SFFR102-3FT
  • This combination 2" Field Flattener and 0.8x Focal Reducer from Stellarvue is specifically designed for SVR102T Refractors using a 3" Feather Touch focuser.
  • Converts the f/7 SVR102T with 714 mm focal length into a faster f/5.6 instrument with 571 mm focal length.
  • One end of this reducer/flattener threads onto the 3" Feather Touch focuser while the other end screws into a DSLR or CCD camera's t-ring.
  • The SFFR102-3FT has the same back focus, 55 mm, as a DSLR camera with proper t-ring.
$239.00
Stellarvue 2" Field Flattener Reducer for SV115T with 3" FT Focusers

Stellarvue SV115 2" Flattener 0.8X Reducer for 3" FT Focusers - SFFR115-3FT

SKU: STV-SFFR115-3FT
  • 2” Field Flattener and 0.8x Focal Reducer combination for Stellarvue SV115 refractors using a 3” Feather Touch focuser.
  • Provides the Stellarvue 115 mm refractor telescope with an effective focal length reduction from f/7 to f/5.6.
  • Threads onto the SV115's 3" Feather Touch focuser.
  • M42 threads on the camera side for compatibility with standard DSLR T-rings or cameras with 42 mm threads.
  • For DSLR imaging, your camera plus proper M42 spacer are required to have a 55 mm back focus.
$239.00
Stellarvue 2" Field Flattener Reducer for SV115T with 2.5" Focusers

Stellarvue SV115 2" Flattener 0.8X Reducer for 2.5" Focusers - SFFR115-25

SKU: STV-SFFR115-25
  • This Reducer/Flattener is made especially for Stellarvue SV115 refractors with 2.5" Stellarvue and Feather Touch focusers.
  • Enables effective focal length conversion from f/7 (805 mm) to f/5.6 (644 mm).
  • Standard 48 mm filter thread helps ordinary 2" filters enhance this reducer/flattener when imaging.
  • 55 mm back focus is required to match that of your DSLR camera plus appropriate spacer for DSLR imaging.
$229.00
Stellarvue 2" Field Flattener Reducer for SV115 with 2" Focusers

Stellarvue 2" Flattener & 0.8X Reducer for SV115 Refractors with 2" Focusers - SFFR115-2

SKU: STV-SFFR115-2
  • Reducer & Flattener for Stellarvue SV115 with 2" focuser
  • Changes the effective focal length from f/7 to f/5.6
  • Telescope side slides into the 2" focuser
  • Camera side has M42 threads for standard DSLR T-rings or cameras with 42 mm threads
  • Back focus is 55 mm for DSLR imaging, add M42 spacers to match back focus required for your camera
$195.00

These quality field flatteners from High Point Scientific create wide, flat viewing fields for stargazing. When your scope is sharply focused, you may notice stars and other celestial objects at the edge of your field of view to appear blurry or unfocused. A field flattener corrects this problem. They reduce the normal field curvature inherent in most refractors. The result is an image that is sharply focused out to the very corners of your field of view. A field flattener is also must-have for observers interested in astrophotography. This way your images are sharp and clear without any distortions at the edges.


We offer a full line of field flatteners for you to choose from. We carry field flatteners from virtually all major brands, including Celestron, Stellarvue, Meade, William Optics, Orion as well as many others. Many can be used with either a CCD or DSLR camera with the correct t-ring installed. However, when using a field flattener with a CCD camera, you may need extension tubes or spacer rings to achieve the necessary backfocus. This is because the backfocus of CCD cameras depend on the model.


Not all field flatteners are created equal. Oftentimes, a field flattener also has focal reducer capabilities, so you can get wider shots out of your scope. Be sure to check each field flattener we carry to see if you can use it as a focal reducer as well. Field flatteners also come in many different sizes, sometimes designed for a specific telescope model. If you’re unsure what to get for your scope, the experts at High Point Scientific are standing by to help!

High Point Scientific is rated 4.9/5 based on 1347 reviews