Sky-Watcher Reducer/Flattener for Esprit Triplet
Best focal reducer for serious astrophotographers using triplet telescopes.
This optical accessory optimizes imaging performance by shortening focal length and flattening the field of view. It enables faster exposure times while maintaining a corrected image circle suitable for mid-sized sensors.
$525.00
Who it's for
- Astrophotographers using large format sensors for edge-to-edge sharpness
- Imagers seeking faster data collection and shorter exposure times
- Full-frame camera users needing to eliminate vignetting
Who should skip it
- Owners of telescopes other than the Esprit 150ED
- Beginners intimidated by precise back-focus spacing requirements
- Photographers shooting in fields with extremely bright stars
Performance breakdown
Imaging Speed
The 0.77x reduction significantly cuts exposure times for faster deep-sky captures.
Field Correction
Delivers pinpoint stars across the entire 36mm APS-C image circle.
System Compatibility
Standard M48 threading ensures seamless integration with most modern imaging trains.
Setup Flexibility
Dual back focus options accommodate both standard and custom imaging configurations.
Build Integrity
Robust aluminum and glass construction withstands rigorous, long-term field use.
Sensor Coverage
Optimized perfectly for APS-C sensors, though full-frame users may see vignetting.
Key Specs
Reduction Factor
0.77x
Imaging Focal Ratio
f/5.4
Image Circle
36mm
Back Focus (with M48 adapter)
55mm
Back Focus (internal thread)
75mm
Internal Thread
M71x1
Optical Design
Three-element
Telescope Compatibility
Apochromatic Refractor
Material
Aluminum, Glass
Know before you buy
Still have a question?
Ask Metto anything about the Sky-Watcher Reducer/Flattener for Esprit Triplet before you decide.
