Astronomy Specialist



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The TS optics 0.5x reducer shortens the focal lengths of the telescope by 50% and doubles the focal ratio and field of view. This can be useful for astrophotography using cameras with smaller sensors. Due to the doubled speed, the exposure time is reduced to a quarter.

The reducer can be easily threaded into the 2" filter receptacle of your camera or eyepiece and can be used with sensors up to 20mm diagonally across before vignetting is introduced. Works with refractors of long focal length, Schmidt-Cassegrain and Maksutov-Cassegrain telescopes.

Please note that the TS Reducer does not correct image distortions like coma, field curvature or astigmatism. Newtonian coma will be increased by the wider field, so it is not recommended for systems faster than f/6.

You can also use the reducer for visual observation with any 1.25" eyepiece by screwing the reducer into the 2" filter thread of the 2" - 1.25" adaptor. With 2" eyepieces, you can use the reducer directly for models with max. field stop diameter of approx. 40 mm. Bigger eyepieces will show vignetting.


M48 x 0.75 (2" filter thread)
Optical design 2 elements in 1 group
Max distance to camera sensor Approx. 65 mm
Max sensor size 20 mm
Clear aperture 37 mm
Cell length without male thread 16.6 mm
Weight 70 g
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