Field Flattener, Focal Reducer
$479.99
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Field Flattener, Focal Reducer
$479.99
0.7x Focal Reduction
Faster Speeds Wider Fields
Flat-Field Optics
Sharp Edge To Edge Images
Multi-Coated Glass
Maximum Light Transmission Clarity
In Stock
Starlight Precision EnhancementTransform Your Astrophotography Capabilities Today
The Explore Scientific 3" Field Flattener .7x Focal Reducer is a high-performance optical accessory engineered to significantly enhance your astrophotography results. By reducing your telescope's f-ratio by 0.7x, it delivers wider fields of view, brighter exposure times, and eliminates curved focal plane distortion across your camera frame. Compatible with 127mm and 152mm refracting telescopes, this fully multi-coated optic ensures crisp, flat-field astro-imaging.
Advanced Astronomical Imaging OpticsCapture Stunning Deep Space Detail
Take your astrophotography to the next level with the Explore Scientific 3" Field Flattener .7x Focal Reducer. Designed specifically for refractors such as the Explore Scientific 127mm and 152mm triplet APO systems, this essential optical corrector solves off-axis aberrations while simultaneously speeding up your focal ratio. Experience 55mm of precise back focus to accommodate standard DSLR and dedicated astro-imaging camera setups. Crafted with premium fully multi-coated optics, this flattener-reducer maximizes light transmission, dramatically reduces required exposure times, and ensures pin-point stars from the center of the image straight to the extreme edges of your sensor.
Technical SpecificationsDetailed Parameters And Dimensions Data
Item Number
FFFR507X-00
Product Type
Field Flattener & Focal Reducer
Focal Reduction Ratio
0.7x
Back Focus
55 mm
Optics Coating
Fully Multi-Coated
Compatible Telescopes
127mm & 152mm Refractors (f/7.5 to f/8) (telescope)
Focuser Compatibility
3" Rack-and-Pinion / 2" Adapter Included
Camera Adapter
M42x0.75 (6.25mm thickness) (camera)
Outer Diameter
78.3mm
Product Height
90.1mm
Product Weight
1.4 lbs / 0.64 kg
Key Optical CapabilitiesEngineered For Exceptional Deep-Sky Astrophotography
Dual FunctionalityCombined 0.7x focal reduction and field flattening
Enhanced Field ViewProvides wider coverage and significantly brighter exposures
Multi-Coated OpticsPremium anti-reflective coatings deliver high contrast
Standard Back FocusOffers 55mm back focus distance for astrophotography gear
Included AdapterThreaded adapter included for 2-inch rack-and-pinion focusers
System CompatibilityOptimized for f/7.5 and f/8 triplet refracting telescopes
Frequently Asked QuestionsEverything you need to know
What does the Explore Scientific 3" Field Flattener .7x Focal Reducer do for astrophotography?
The Explore Scientific 3" Field Flattener .7x Focal Reducer flattens the optical field to eliminate off-axis distortion and reduces the telescope's focal ratio by 0.7x, giving you wider fields of view, brighter images, and shorter exposure times.
What back focus distance is provided by the Explore Scientific 3" Field Flattener .7x Focal Reducer?
The Explore Scientific 3" Field Flattener .7x Focal Reducer provides a standard 55 mm of back focus distance measured from the rear flange to the camera sensor.
Which telescopes are compatible with the Explore Scientific 3" Field Flattener .7x Focal Reducer?
The Explore Scientific 3" Field Flattener .7x Focal Reducer is recommended for Explore Scientific 127mm and 152mm triplet refracting telescopes operating at f/7.5 to f/8 focal ratios.