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Antares' 0.5x focal reducer screws on to any accessory (such as eyepieces, camera adapters, CCD camera nosepieces, etc.) that accepts standard 2" threaded filters and provides a nominal reduction of 0.5x. The actual focal length reduction will vary a little over or under 0.5x depending on where the focal reducer is placed exactly in the optical path. The reducer features fully coated optics (2-elements) in a metal filter ring. This focal reducer will work well for visual use too when coupled with eyepieces. Focal length = 158mm.
Note that the use of any optical element like barlows and focal reducers changes the focus point of your telescope, requiring additional in-focus or out-focus travel. The exact amount of focus travel required will depend on the optics and mechanics of your specific set-up (telescope, diagonal (if used), barlow/reducer, and eyepiece). Hence, be aware that you may not be able to reach focus with all eyepieces or in all configurations with a given barlow/reducer.
Description copyright: Agena AstroProducts (2008). Reproduction without permission prohibited. |
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