Addendum - Optical Components
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Reducer / Flattener
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updated: 2026-02-06
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By reducing the focal length (and in case of flatteners also improving the projection distortion) these devices improve the speed of the scope by the reduction factor.
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R: Reducer or Flattner
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OtherOpticalComponents
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EquipmentTypePtr
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OtherLabel
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Factor
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OpticalLength
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ReducerBackfocus
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Weight
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Manufacturer
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Description
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M63 Riccardi 0.75 Reducer
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Reducer
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R75
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0,75
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0
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76,2
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500
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TS-Optics
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76,2 mm is the optimum backfocus for the TSO 90/600 Triplet, see https://astroguide.starlust.de/html/Riccardi075BackfocusTable.html
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M48 0.67 Reducer
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Reducer
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R67
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0,6804
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0
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85
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105
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TS-Optics
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backfocus should be betwenn 70 to 90 mm, optimum at 85 mm
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Fuji TC 1.4
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Reducer
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1,4
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0
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Fujifilm
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