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GSO's popular 1.25" 0.5x focal reducer screws on to any accessory (such as
eyepieces, camera adapters, etc.) that accepts standard 1.25" threaded
filters and provides a nominal reduction of 0.5x. Use of this focal
reducer effectively halves the focal ratio of your telescope, resulting
in a wider field of view and significantly shortened exposure times for
astrophotography. For example, use of this reducer will convert an f/10
telescope into an f/5 scope.
The 2-element reducer features
fully multi-coated optics in a black-anodized aluminum filter cell. It
also has additional 1.25" female threads so you can screw/stack
additional 1.25" filters on to this reducer. This focal reducer will
work well for
visual use too when coupled with the right kind of eyepieces and
telescopes (it is not recommended for very fast scopes or very wide
angle eyepieces for visual applications).
The actual focal
length reduction will vary a little over or under 0.5x
depending on exactly where the focal reducer is placed in the optical
path. An optional 25mm extension tube is available separately to change the reduction value provided by this reducer. When screwed into an eyepiece, this focal reducer will need 8mm (+/- 1mm) of additional in-focus travel so please make sure that your focuser can
accommodate this travel requirement.
Total
length (including external thread) = 13mm (0.51"); Total length
(excluding external thread) = 10mm (0.39"); Weight = 0.5 oz.; Made in
Taiwan.
If you have any comments or reviews you'd like to share with us, please email us. Thank you.
Description copyright: Agena
AstroProducts (2007). Reproduction without permission prohibited.
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