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Antares' new 0.5X and 0.7x focal reducers screw on to any accessory (such as eyepieces, camera adapters, CCD camera nosepieces, etc.) that accept standard 2 " threaded filters and provide a nominal reduction of 0.5X or 0.7X. The actual focal length reduction will vary a little over or under the nominal reduction factor depending on where the focal reducer is placed exactly in the optical path. The reducers feature fully coated optics in a metal filter ring. They also have additional threads so you can screw/stack additional filters on to these reducers. These focal reducers will work well for visual use too when coupled with eyepieces.
Focal length = 220mm.
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