Takahashi Seisakusho
Encyclopedia
Takahashi Seisakusho is a Japanese manufacturer of telescopes and related equipment, such as eyepieces and mounts.
Often known simply as 'Tak', the brand is especially noted amongst amateur astronomers for its range of apochromatic refractors, but also produces various types of reflectors
, and instruments featuring compound optics.
Takahashi pioneered the use of fluorite
crystal in place of one of the glass elements in the objective lens of an astronomical telescope, although this material had previously been used in other optical devices. The company's name would become synonymous with the use of this type of crystal.
In recent years however, Takahashi has produced some telescopes using extra-low dispersion ("ED")
FPL-53 glass in place of fluorite in the objective lens.
High-performance glass that contains fluorine should not be confused with fluorite crystal, which is not glass.
Some other telescope manufacturers use Takahashi refractors as collimating instruments for larger telescopes.
Often known simply as 'Tak', the brand is especially noted amongst amateur astronomers for its range of apochromatic refractors, but also produces various types of reflectors
Reflecting telescope
A reflecting telescope is an optical telescope which uses a single or combination of curved mirrors that reflect light and form an image. The reflecting telescope was invented in the 17th century as an alternative to the refracting telescope which, at that time, was a design that suffered from...
, and instruments featuring compound optics.
Takahashi pioneered the use of fluorite
Fluorite
Fluorite is a halide mineral composed of calcium fluoride, CaF2. It is an isometric mineral with a cubic habit, though octahedral and more complex isometric forms are not uncommon...
crystal in place of one of the glass elements in the objective lens of an astronomical telescope, although this material had previously been used in other optical devices. The company's name would become synonymous with the use of this type of crystal.
In recent years however, Takahashi has produced some telescopes using extra-low dispersion ("ED")
Low dispersion glass
Low dispersion glass is a type of glass with low dispersion. Crown glass is an example of a relatively inexpensive low-dispersion glass....
FPL-53 glass in place of fluorite in the objective lens.
High-performance glass that contains fluorine should not be confused with fluorite crystal, which is not glass.
Some other telescope manufacturers use Takahashi refractors as collimating instruments for larger telescopes.