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Stellarvue 2" Flattener & 0.8X Reducer for SV115 Refractors with 2" Focusers - SFFR115-2

SKU: STV-SFFR115-2

Stellarvue 0.8X Reducer/Flattener
for SV115T with 2” Focuser

The Stellarvue SFFR115-2 is a 2” Field Flattener with 0.8X focal reduction - it reduces the f/7 focal ratio of the Stellarvue 115 mm Triplet to f/5.6.

The Stellarvue 2” Focal Reducer/Field Flattener slips into the 2” focuser of the SV115T. Take a look at the additional images and you will see examples that show you how to use a DSLR or CCD camera with the flattener/reducer. A DSLR camera with its proper t-ring has 55 mm of back focus, which matches the back focus of the SFFR102-2. This allows you to simply screw the flattener/reducer onto the camera with t-ring installed, and then slide the other end into the focuser.

Using the Stellarvue flattener/reducer with a CCD camera is still simple, but since the backfocus varies depending on the CCD camera model, M42 x .75 extension tubes or spacer rings may need to be used to make sure the back focus (distance from the back of the flattener to the sensor) matches that of the flattener/reducer (55 mm).