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Astrophotography Deal - Celestron 11" RASA - $1000 Off - Now Only $2595 - Limited Quantity On Hand

Field Flatteners

Items 1 - 25 of 52

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
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$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

Apertura Adjustable Flattener for 60EDR and 72EDR - FFADJ

SKU: APT-FFADJ
  • 1X Flattener for Apertura 60EDR or 72EDR Refractors
  • The Apertura Flattener adjusts approximately 5 mm for proper backfocus
  • Accepts 48mm Wide T-Ring for DSLR (sold separately)
  • Full frame!
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$149.95
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
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.
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$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.
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$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.
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$249.00
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
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.
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$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.
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$179.00