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Explore Scientific

Explore Scientific 0.8x Focal Reducer for f/5 to f/7 Refractors – ES-FR0.8x

Explore Scientific 0.8x Focal Reducer for f/5 to f/7 Refractors – ES-FR0.8x

$149.99
$149.99
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The Explore Scientific 0.8x Focal Reducer for f/5 to f/7 Refractors (ES-FR0.8x) is engineered to deliver wider fields of view, faster imaging performance, and improved edge-to-edge clarity for both visual observing and astrophotography. By reducing your telescope’s focal length by 20 percent, this reducer increases image brightness and reduces exposure times—an essential upgrade for capturing expansive nebulae, star fields, and large deep-sky targets.

Designed specifically for refractor telescopes in the f/5 to f/7 focal ratio range, this reducer maintains a flat, well-corrected field with minimized vignetting and significantly reduced off-axis aberrations. Multi-coated precision optics ensure optimized contrast, sharpness, and light transmission. Its compact, precisely machined housing integrates seamlessly into standard imaging setups and visual observing trains.

This focal reducer enhances the performance of portable refractors and imaging refractors, making it an efficient tool for astrophotographers looking to capture large-scale celestial structures with greater speed and clarity.

Compatible Telescopes 

This reducer is compatible with refractors that fall within the f/5 to f/7 range, including:

  • FirstLight 80mm f/5 Achromatic Refractor

  • FirstLight 102mm f/6.5 Refractor

  • FirstLight 152mm f/6.5 Refractor

  • ED80 f/6 Air-Spaced Triplet

  • ED102 f/7 Air-Spaced Triplet

  • ED102 f/7 FCD100 Triplet (within optimal range)

  • ED127 f/7.5 Triplet (functional but near the upper limit)

Note: This list reflects commonly paired telescopes within the stated focal ratio range. Any refractor between f/5 and f/7 is optically compatible.

Features

  • 0.8x focal reduction for wider fields and faster imaging

  • Optimized for refractors in the f/5 to f/7 focal ratio range

  • Improves image brightness and reduces exposure times

  • Helps correct vignetting and off-axis optical distortions

  • Multi-coated precision optics for high-contrast performance

  • Suitable for wide-field visual observing and astrophotography

  • Durable, precision-machined housing for stability and alignment

Specifications

Specification Details
Model/SKU ES-FR0.8x
Type 0.8x focal reducer
Compatible Focal Ratios f/5 to f/7 refractors
Reduction Factor 0.8×
Optical Design Precision multi-coated elements
Barrel / Connection Configurable for typical 2" or threaded imaging setups
Weight Approx. 0.25–0.35 lb
Included 0.8× focal reducer unit
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Frequently Asked Questions

With a beginner telescope you can see a surprising amount — the craters and mountains on the Moon, the rings of Saturn, the moons of Jupiter, and star clusters like the Pleiades. As you get more comfortable, you can also spot nebulae and distant galaxies. Not sure which beginner telescope is right for you? Check out our Telescope Buying Guide.
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