Explore Scientific 0.8X Focal Reducer for 80 mm & 120 mm APO Telescopes - ES-FR0.8X

The Explore Scientific 0.8x Focal Reducer lets astrophotographers explore the wonders of wide-field astrophotography in an easy-to-use package.

The 0.8x Focal Reducer works with the following Explore Scientific telescopes:

• ED80 Essential Series Air-Spaced Triplet Refractor Telescope - ES-ED0806-02

• ED102 Essential Series Air-Spaced Triplet APO Refractor Telescope - ES-ED10207-02

• ED80-FCD100 Series Air-Spaced Triplet Refractor Telescope - FCD100-0806-02

• ED102-FCD100 Series Air-Spaced Triplet Refractor Telescope - FCD100-10207-02

• ED102-FCD100 Series Air-Spaced Triplet Telescope in Carbon Fiber - FCD100-10207-CF-01

The 2-element 0.8x focal reducer turns the 480mm 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.

The faster f/ratio, coupled with more light-gathering aperture, allows more light to fall onto the camera sensor. For instance, to capture the same amount of light as a 100-second exposure with the Explore Scientific 80 mm takes 256 seconds on a 50 mm, 178 seconds on a 60 mm, and 131 sec on 70 mm – assuming the same f/ratio. This means that the Explore Scientific 80mm telescope with the 0.8x Focal Reducer can capture far more detail faster than the competition.

The Explore Scientific 0.8X 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.