Telescope reducer Celestron 94175 Black Compatibility Celestron C14

The Celestron 94175 telescope reducer is a focal reducer and field corrector designed for Celestron Schmidt-Cassegrain telescopes, with direct compatibility for the Celestron C14. It has a compact, black metal housing with external dimensions of approximately 62 mm width, 62 mm depth and 50 mm height. Installed between the telescope visual back and camera or eyepiece, the reducer shortens the effective focal length to deliver wider fields of view and improved imaging performance. For C14 telescopes this accessory provides an f/7 focal ratio, while on smaller Celestron SCT models it functions as an f/6.3 reducer/corrector, enabling faster exposures and broader sky coverage for astrophotography.

Advantages

The reducer/corrector offers a combination of focal reduction and field correction in a single compact unit, allowing users to switch between native and reduced focal ratios without modifying the optical train. Its multi-element, fully multi-coated optics maintain image quality across the field while reducing exposure times by roughly a factor of three for photographic use. The black finish and robust mechanical construction ensure stable mounting and alignment with Celestron Schmidt-Cassegrain telescopes.

Suitable for

• Wide-field astrophotography with Celestron C14 and other Schmidt-Cassegrain telescopes
• Reducing effective focal length for imaging extended deep-sky objects
• Visual observing when a wider field of view is required
• Users who need faster focal ratios to reduce exposure time

Key specifications

• Design: Focal reducer combined with field corrector (four-element, fully multi-coated)
• Effective focal ratio on C14: f/7
• Effective focal ratio on C5/C6/C8/C9.25/C11: f/6.3
• Primary use: Wide-field imaging and field correction for Schmidt-Cassegrain telescopes
• Typical effect on exposure times: up to ~3× reduction for astrophotography
• Finish and material: black exterior housing, mechanical mounting compatible with Celestron SCT visual back
• Approximate external dimensions: 62 mm × 62 mm × 50 mm

How to use

Mount the reducer/corrector between the telescope's visual back or focus tube and your camera or visual adapter, ensuring secure mechanical connection and correct backfocus distance as specified for your Celestron SCT model. When used on a C14, the unit produces an f/7 focal ratio; when used on smaller Schmidt-Cassegrain models it produces an f/6.3 focal ratio. After installation, achieve focus with the camera or eyepiece and check field illumination; adjust spacing slightly if necessary to reach best focus across the field. For astrophotography, verify framing and focus with guide exposures and confirm that guide corrections and image scale meet your requirements.

Usage recommendations

Use the reducer/corrector when you need wider fields or faster focal ratios for deep-sky imaging; pair it with a well-collimated Celestron SCT and appropriate spacer or adapter to achieve correct backfocus. For best photographic results, use a cooled astronomy camera or CCD, calibrate frames (bias/dark/flat), and perform careful focus and guiding. When switching between reduced and native focal ratios, recheck focus and balance the mount to maintain tracking performance.