Stellarvue 0.8X Reducer Flattener for SV115 with 2.5" Focuser

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Stellarvue 0.8X Reducer Flattener for SV115 with 2.5" Focuser
Item # SV-SFFR115-25
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  • Stellarvue Field Flattener & Reducer for the SV115 Refractor with a 2.5" focuser.
  • The reduction factor of the SFFR115-25 is 0.8X, creating an f/5.6 focal ratio.
  • The backfocus of this SV 2.5” Flattener Reducer is 55 mm.
  • The telescope side of the reducer/flattener threads into the focuser and accepts standard 2” filters. The camera side is a standard t-thread (M42x0.75).


Stellarvue 2.5” 0.8X Reducer Field Flattener for SV115

The Stellarvue SFFR115-25 Reducer Flattener is optimized for use with the SV115 that sports either an SV 2.5" focuser or a 2.5" Feather Touch Focuser. The SV Reducer Flattener threads into the 2.5" focuser. A 48 mm filter thread is machined into the reducer flattener, allowing you to add standard 2” filters when desired. The focal reduction of the SFFR115-25 is 0.8X, which converts the focal ratio of your SV115 to f/5.6.

The backfocus of the Stellarvue 2.5” Reducer Flattener is 55 mm. Since a DSLR with t-ring has a 55 mm backfocus, it is a simple matter to use the reducer/flattener for DSLR imaging. Just insert the reducer/flattener into the SV115 focuser and then thread the camera/t-ring combo onto the flattener. An example is shown in the additional images section to the left.

If you will be imaging with a CCD camera as opposed to a DSLR, extension tubes may be required to achieve focus. It is important that you know the distance between your camera’s t-thread and the sensor, and it is equally important to remember that the distance from the back of the field flattener/reducer to the CCD sensor remains at 55 mm. If the CCD camera, for instance has a backfocus of only 35 mm, a 20 mm extension will be needed. If any extension tubes are required for your set-up, they will thread between the camera and the field flattener, as shown in the example provided in additional images. Please note that the camera side of the reducer/flattener requires extension rings with a standard t-thread (M42x.75).

Additional Information

Additional Information

Manufacturer Stellarvue
Barrel Size 2.5"
Warranty 2 Year Warranty
Included Items

Included Items

  • Stellarvue 0.8X Focal Reducer Field Flattener for SV115 with 2.5" Focuser
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