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About this product
Convert your Sky-Watcher Esprit 150ED or 150EDX into a swift, wide-field astrophotography system with this dedicated 0.77x focal reducer and field flattener. By quickening your focal ratio from f/7 down to f/5.4, it slashes required exposure durations while ensuring round, pinpoint stars across large camera sensors. It offers the ideal optical solution for capturing elusive deep-space detail when clear sky conditions are fleeting.
Fast f/5.4 Speed
Cuts exposure time by ~68%
Edge-to-Edge Field
Removes refractor curvature
36mm Image Circle
Covers APS-C and full-frame
Versatile Back-Focus
55mm standard or 95mm native
Faster Light Gathering for Deep Space
Accelerating the optical system by a factor of 0.77x shifts your refractor from f/7 to a brisk f/5.4. This substantial gain in optical speed lowers overall integration times by approximately 68%, letting you capture faint nebulae and distant galaxies efficiently. You can maximise every imaging session by gathering clean, high-signal data under short observing windows.
Edge-to-Edge Aberration Correction
Designed specifically for the optical geometry of the Esprit triplet refractors, this corrector neutralises inherent field curvature across wide sensors. Its multi-coated optical elements deliver crisp, uncompromised star shapes right to the corners of a generous 36mm illuminated image circle. The result is high-contrast, distortion-free framing primed for precision stacking.
Robust Astrophotography Integration
Crafted from machined aluminium, this optical unit mounts securely into dedicated astronomy cameras and DSLR imaging trains alike. It supplies 95mm of native back-focus for bespoke filter wheels, or standard 55mm spacing using the supplied spacer hardware and M48 ring. An integrated internal thread also allows direct attachment of 50.8 mm (2 in) astronomy filters.
Accelerated Exposure Efficiency By increasing optical speed from f/7 to f/5.4, this focal reducer slashes exposure requirements by roughly 68%, making every clear night far more productive.
Key Features
0.77x Focal Reduction – Shortens effective focal length to broaden the field of view for large nebulae and expansive starfields.
Complete Edge Correction – Flattens field curvature to preserve crisp, pinpoint stars across the entire frame.
36mm Illuminated Circle – Delivers broad, uniform light coverage suitable for both APS-C and full-frame sensors.
Adaptable Back-Focus Spacing – Configurable for 95mm native spacing or 55mm working distance via the included spacer kit.
Multi-Coated Optics – High-grade polished glass elements maximise light transmission while suppressing internal ghosting.
Threaded Filter Integration – Accommodates standard 50.8 mm (2 in) filters straight inside the imaging train.
Dedicated Esprit Matching – Tailored precisely for the optical performance of Sky-Watcher Esprit 150ED and 150EDX refractors.
Specifications
Compatible Telescopes
Sky-Watcher Esprit 150ED & Esprit 150EDX APO Refractors
Reduction Factor
0.77x
Native Focal Ratio
f/7
Resulting Focal Ratio
f/5.4
Exposure Benefit
Approx. 68% reduction
Corrected Imaging Circle
36mm fully illuminated
Sensor Compatibility
APS-C and Full-Frame
Field of View (Full Frame)
Approx. 3.18° × 2.12°
Field of View (APS-C)
Approx. 2.08° × 1.39°
Back-Focus
95mm native / 55mm with included spacer & M48 ring
Filter Compatibility
50.8 mm (2 in) threaded filters
Housing Material
Aluminium
What's in the Box
Sky-Watcher 0.77x Reducer / Field Flattener for Esprit 150ED & 150EDX