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Ships within 48 hours · Estimated delivery Aug 7 - Aug 12
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Description
Explore Scientific 3" Field Flattener .7x Focal ReducerThe Explore Scientific 3" Field Flattener 0. 7x Focal Reducer is a dual function optical corrector that both flattens the field and reduces focal length by 0. 7x two corrections in a single accessory. Designed for the larger Explore Scientific 127mm and 152mm triplet refractors, the 3" barrel provides a wider clear aperture than 2" correctors, reducing vignetting on larger camera sensors. The 0. 7x reduction is more aggressive than the standard 0. 8x
The Explore Scientific 3" Field Flattener / 0.7x Focal Reducer is a dual-function optical corrector that both flattens the field and reduces focal length by 0.7x — two corrections in a single accessory. Designed for the larger Explore Scientific 127mm and 152mm triplet refractors, the 3" barrel provides a wider clear aperture than 2" correctors, reducing vignetting on larger camera sensors.
The 0.7x reduction is more aggressive than the standard 0.8x reducer, delivering wider fields of view and faster f/ratios. An f/8 refractor becomes f/5.6 — a significant speed increase that cuts required exposure times substantially. Fully multi-coated optics maintain contrast and light transmission through the optical path.
Includes a 3" nosepiece and M42x0.75 adapter for standard T-ring camera connections. Back-focus distance is 55mm from the rear flange. For 2" focuser users, the 2" Adapter for FFFR507X-00 is available separately.
Key Features
- Dual-function: field flattener + 0.7x focal reducer in one unit
- 3" barrel — larger clear aperture than 2" correctors for reduced vignetting
- Fully multi-coated optics
- 55mm back-focus standard
- Includes 3" nosepiece and M42x0.75 T-thread adapter
Compatible Telescopes
- ES 127mm refractors: ED127, FCD100-127 (triplet APO/ED designs)
- ES 152mm refractors: ED152, FCD100-152 (triplet APO/ED designs)
- Focal ratio range: f/7.5 to f/8 (tested and confirmed for both)
- Not compatible with: Doublet refractors
Ideal For
- Deep-sky astrophotographers — the 0.7x reduction and field flattening deliver wide, flat fields from premium refractors
- Large-sensor imaging — the 3" barrel passes a wider light cone than 2" correctors, reducing edge vignetting on APS-C and full-frame sensors
Shipping Notes
- Free Standard Shipping on $100+ Orders to the USA.
- Except Preorder products are shipped in 48 hours.
- Delivery to the USA:
- Standard Shipping : 3-10 business days
- If time is of the essence, please consider selecting expedited delivery for faster service.
Exchange/Return Notes
- We offer a 30-day return/exchange service after receiving.
- Final sale items are not eligible for returns or exchanges.
- To process your return/exchange, please contact us at [email protected]
- Please click here for more details>>> Return & Exchange Policy