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Focal Reducer
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Focal Reducer is an optical element used to reduce focal length, increase lens speed, and in some instances improve optical transfer function (OTF) performance.

Popular applications include photographyvideography, and astrophotography. In astrophotography, these qualities are most desirable when taking pictures of nearby large objects, such as nebulae.

GSO 0.5x Focal Reducer 1.25" with 25mm extension tube Rs 1560 + 18% GST
0.5x focal Reducer 1.25" for Visual & Astrophotography.

GSO's 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.
 
DESCRIPTION
Free aperture 22.5 mm
Optical system multi-coated doublet
Reducing factor 0.5x (depending on the projection distance)
Function 0.5x Reducer for Visual and Astrophotography
Max. distance to the camera sensor approx. 55 mm
Connection 1.25" filter thread (M 28.5 x 0.6) on both sides

GSO 0.5x Focal Reducer 2" Rs 2100 + 18% GST
0.5x focal Reducer 2" for Visual & Astrophotography.

The GSO 0.5x focal reducer provides a nominal reduction of 0.5 times. 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 2-element fully multi-coated optical design and blacked lens edges in a black anodize aluminum filter cell.

It comes with outside thread M48x0.75 to fit with most 2" eyepieces the additional 2" filter thread inside accept all kinds of 2" color filters.
DESCRIPTION
Free aperture 45 mm
Optical system multi-coated doublet
Reducing factor 0.5x (depending on the projection distance)
Function 0.5x Reducer for Visual and Astrophotography
Max. distance to the camera sensor approx. 55 mm
Connection Filter thread 2" (M48x0.75)
2" filter thread on both side
 
 
 
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