Explore Scientific 3" Field Flattener .7x Focal Reducer
Explore Scientific 3" Field Flattener .7x Focal Reducer is backordered and will ship as soon as it is back in stock.
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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. It is recommended for the larger Explore Scientific 127mm and 152mm triplet refractors.
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. Its optics are fully multi-coated.
Includes an 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
- Fully multi-coated optics
- 55mm back-focus standard
- Includes M42x0.75 T-thread adapter
Ideal For
- Deep-sky astrophotographers — the 0.7x reduction and field flattening deliver wide, flat fields from premium refractors
Accessories & Compatibility
- ES 127mm refractors: ED127, FCD100-127 (triplet APO/ED designs)
- ES 152mm refractors: ED152 (triplet APO/ED design)
- Focal ratio range: f/7.5 to f/8 (tested and confirmed for both)
- Not recommended for: Doublet refractors
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