Meade ACF 0.68x Focal Reducer

The Meade ACF 0.68x Focal Reducer with 50mm T-thread Adapter enhances the functionality of astrophotography when using Meade’s Advanced Coma Free (ACF) telescopes.

Meade ACF 0.68x Focal ReducerBy reducing the telescope’s effective focal length and “speeding up” the focal ratio, the 0.68x focal reducer significantly shortens the long exposure times needed to produce images of faint deep sky objects. In addition, the focal reduction renders a wider field of view, allowing capture of larger objects in a single frame.

With the Meade ACF 0.68x Focal Reducer between an ACF telescope and DSLR or dedicated astronomical CCD or CMOS camera, you will decrease the capture time and increase your odds of getting sharp, error-free images. The Meade ACF 0.68x Focal Reducer works with all sizes of Meade f/10 and f/8 ACF telescopes. It converts an f/10 telescope into a faster f/6.8 system and an f/8 telescope into f/5.5 configuration offering a nearly 50% wider field of view and exposure times cut by more than half.

The four-element Meade ACF 0.68x Focal Reducer provides full illumination of a 22mm diagonal sensor and nearly full illumination out to 28mm, with just slight vignetting that is corrected with flat field calibration making it ideal for use with APS-C and smaller imaging sensors. It offers 105mm of back-focus distance, measured from the reducer’s flange, or 100mm on-axis from the last lens, providing space for imaging train accessories such as a filter wheel and/or an off axis-guider. The optics are broadband fully multi-coated for maximum light transmission to the camera.

The Meade ACF 0.68x Focal Reducer threads directly onto the rear cell of all Meade ACF telescopes for a solid connection. It comes with a 50mm-long universal T-thread adapter with camera-side male M42 x 0.75 threads, which is ideal for DSLR and similar cameras having the standard 55mm flange back-focus distance when used with a T-ring. For imaging trains exceeding 55mm back-focus, the universal T-thread adapter can be removed to access the reducer’s standard male SCT 2″ x 24 TPI threaded collar. Appropriate spacer rings may be needed to achieve the 105mm back-focus distance for your specific camera and imaging accessories.

The Meade ACF 0.68x Focal Reducer is for photographic use only and weighs 8.5 oz in total and 5.0 oz without T-thread adapter. You can learn more here.

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