The Takahashi FC-76DS is a Fluorite apochromatic doublet refractor which excels as a mobile instrument for visual and photographic use. The air-spaced fluorite doublet has excellent chromatic correction across the visual spectrum. The optional field flatteners and focal reducers transform the FC-76DS into a widefield astrograph.
The FC-76DS is equipped with a precise rack and pinion focuser designed with imaging in mind. The FC-76DS has a native focal length of 570mm and a focal ratio of f/7.5, making it a versatile instrument for both terrestrial and astronomical use.
A selection of different field correctors are available to suit different applications (sold separately).
Spot diagram of Takahashi FC-76DS at prime focus.
Spot diagram of Takahashi FC-76DS with 76D-FL field flattener.
Spot diagram of Takahashi FC-76DS with FC/FS MFL1.04x field flattener.
Spot diagram of Takahashi FC-76DS with 76D-RD focal reducer.
|Fluorite doublet apochromat
|Air-spaced doublet, 1 x fluorite lens
|Focal length at prime focus
|Focal ratio at prime focus
|Backfocus distance at prime focus
|Dew shield diameter
|660 mm with dew shield extended, 567 mm with dew shield retracted
|Prime focus focal length
|Prime focus focal ratio
|Prime focus backfocus distance
|76D-FL flattener focal length
76D-FL flattener focal ratio
76D-FL flattener backfocus distance
76D-FL flattener image circle
|FC/FS MFL 1.04x flattener focal length
|FC/FS MFL 1.04x flattener focal ratio
|FC/FS MFL 1.04x flattener backfocus distance
|FC/FS MFL 1.04x flattener image circle
|76D-RD reducer focal length
76D-RD reducer focal ratio
76D-RD reducer backfocus distance
76D-RD reducer image circle
|EX-Q 1.6x extender focal length
|EX-Q 1.6x extender focal ratio
|EX-Q 1.6x extender backfocus distance