Takahashi TS refractors serie

The TS are the first serie of telescopes produced by Takahashi. It's difficult to have informations about these telescopes, because, we can found several telescopes under the same name.

TS 50

We can found 2 telescopes under the "TS 50" name:

in 1971, an achromatic doublet at f/14 (f=700mm)
in 1977, another achromatic doublet at f/10 (f=500mm)

The 1971 f/14 TS50

TS 65

in 1969, an achromatic doublet at f/14 (f=910mm). It's the first Takahashi Telescope!
in 1970, a triplet at f/15.4 (f=1000).
in 1972, an apochromatique triplet at f/7.7 (f=500mm)
in 1976, an achromatic doublet at f/12.3 (f=800mm)

The first Tak !	The First Tak !	The 1970 at F/15.4	The 1972 triplet f/7.7	in 1979, the triplet f/7.7with P2Z mount

TS 80

in 1970, an air spaced triplet, f/15 (f=1200mm).

TS 90

We can found 4 telescopes under the "TS 90" name:

1977, a fluorite triplet  at f/11.1 (f=1000mm) It's the first fluorite Takahashi telescope!
1978, a triplet at f/13.3 (f=1200)
1978, an achromatic doublet at f/11.1 (f=1000mm)
1979, an achromatic doublet at f/13.3(f=1200)

the fluorite TS90 triplet at f/11.1