0.8x Focal Reducer

• ES-ED0806-02

• ES-ED10207-02

• FCD100-0806-02

• FCD100-10207-02

• FCD100-10207-CF-01

The 2-element 0.8x focal reducer turns the 480-mm-focal-length telescopes into devices with a focal length of 384 mm. This changes the telescopes from an f/ratio of f/6 to a much faster f/4.8. The device turns the 102 mm telescopes, with a focal length of 714 mm, into telescopes with a focal length of 571 mm: From f/7 to f/5.6. Compare this with smaller diameter wide-field telescopes. The ES and FCD100 telescopes gather:

• 1.3 times more light than a 70 mm telescope

• 1.8 times more light than a 60 mm telescope

• A whopping 2.6 times more light than a 50 mm telescope

The faster f/ratio, coupled with more light-gathering aperture, allows more light to fall onto the camera sensor. The focal reducer, which has 55 mm (+/- 2 mm) of back spacing, is threaded to accept a standard 42 mm T-ring, making attaching a camera easy.