Celestron Reducer - Corrector

Convert f/10 to f/6.3: A 37% Focal Length Reduction

This corrector-reducer lens alters the primary optical characteristics of your standard SCT. By reducing the focal length by 37%, it changes an f/10 telescope to a much faster f/6.3 system, and an f/11 telescope to f/7. This has profound benefits for both visual observation and imaging.

Visually, you achieve a wider true field of view with any given eyepiece, making it easier to locate objects and frame large targets like the Andromeda Galaxy (M31) or the Pleiades (M45). For imaging, the faster focal ratio dramatically cuts down on necessary exposure time, allowing you to gather the same amount of signal in about one-third of the time required at f/10.

For C5 to C14 Standard SCTs: Visual and Photographic Use

This reducer is designed specifically for Celestron's standard line of Schmidt-Cassegrain telescopes, offering broad compatibility from the portable C5 up to the observatory-class C14. It threads directly onto the rear cell, creating a secure connection for your imaging train or visual back.

Once installed, you can attach standard accessories like a T-Adapter for your DSLR or a 1.25" visual back for diagonals and eyepieces. While it does provide some field-flattening for improved edge-of-field sharpness, its primary function is focal reduction, making it an essential tool for deep-sky astrophotography with non-EdgeHD optical tubes.

4.3 oz Machined Aluminum Body with Fully Multi-Coated Optics

Engineered for durability and optical clarity, the reducer is housed in a precisely machined aluminum body with a black anodized finish, weighing a mere 4.3 oz. The internal surfaces are blackened and glare-threaded to suppress internal reflections and maximize image contrast, ensuring a dark sky background.

• Fully Multi-coated Lenses: Every air-to-glass surface features high-transmission coatings to ensure maximum light throughput and minimal reflection, preserving the brightness and fidelity of the image.
• Knurled Grip: A textured, knurled surface provides a secure grip for easy threading and unthreading, even when wearing gloves in cold conditions.
• Compact Design: At only 34mm (1.34") in length, it adds minimal backfocus to your optical train, preserving compatibility with most existing accessories.

Standard SCT vs. EdgeHD: Why This Reducer is Not for EdgeHD Optics

It is critical to note that this f/6.3 reducer is engineered for standard Schmidt-Cassegrain telescopes only and is not compatible with Celestron's EdgeHD optical tubes. EdgeHD telescopes have a built-in flattener and require a dedicated, optically matched reducer (like the Celestron .7x Reducer) to maintain their flat-field, coma-free imaging circle.

Using this standard reducer on an EdgeHD telescope will result in degraded optical performance and will not achieve the designed image quality of the EdgeHD system. If you own an EdgeHD scope, you must use the reducer specifically designed for that optical system.