Stellarvue 0.8X Reducer Flattener for SV115 with 2.5" Focuser

  • Sale
  • Regular price $295.00
  • Stellarvue 0.8X Reducer Flattener for SV115 with 2.5" Focuser

    • Sale
    • Regular price $295.00
    • ITEM #



    • Threads right onto the back of the 2.5" Stellarvue Focuser
    • Reduces SV115 focal ratio from F/7 to f/5.6
    • Reduces focal length from 805mm to 644mm
    • 55mm backfocus to fit any DSLR with a T-ring
    • Corrected image circle covers ASP-C Sensors (29mm)

    Stellarvue 0.8X Reducer Flattener for SV115 with 2.5" Focuser

    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).

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