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Takahashi

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Item Includes Description Features Specifications

Takahashi CN-212 Cassegrain/Corrected Newtonian Telescope Optical Tube (Cass Focus 8.3" 2650mm f/12.2, Newtonian Focus 820mm f/3.9) with 7x50 Finder, Photo Corrector & Collimating Tools

Mfr. Part: TNK2120     SKU: TKTNK2120

Takahashi CN-212 Cassegrain/Corrected Newtonian Telescope Optical Tube (Cass Focus 8.3" 2650mm f/12.2, Newtonian Focus 820mm f/3.9) with 7x50 Finder, Photo Corrector & Collimating Tools
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Item Includes
CN-212 Telescope Optical Tube - 7x50 Finder - Photo Corrector - Collimating Tools
Description
The idea of combining the advantages of Cassegrain and Newtonian configurations in one instrument has been around for a long time but with very few examples commercially available.

Thus it was not so much a novelty of telescope optics , but rather the result ofa long held need for the ideal all-round telescope for amateur use that gavebirth to the Takahashi CN-212.

The optical principle of the CN-212 is simple yet clever. From a primary short focus parabolic mirror, pierced centrally, different optical configurations are possible depending on the secondary mirror placed in the light cone.

Here we have two telescopes in one, an f/12.4 Cassegrain as the basic configuration, with a hyperbolic secondary mirror for high resolution work, or when you require, by simply replacing the secondary mirror and coupled with a low profile 2" eyepeice adaptor and associated field corrector, you transform your instrument into a brilliant wide field Newtonian with a focal ratio of f/3.9.

Specifications
Item #Takahashi CN-212
Effective AperatureCassegrain: 212mm
Newtonian: 212mm
Diameter of SecondaryCassegrain: Ø 68mm
Diameter of DiagonalNewtonian: Ø 72mm
Focal LengthCassegrain: 2630mm
Newtonian: 820mm
Focal RatioCassegrain: F12.4
Newtonian: F3.9m
Light GraspLight gathering power: Cassegrain: 917x
Newtonian: 917x
ResolutionCassegrain: 0.55"
Newtonian: 0.55"
Limiting MagnitudeCassegrain: 13.4
Newtonian: 13.4
Image CircleCassegrain: 36
Newtonian: 43
Photo FieldCassegrain: 0.8°
Newtonian: 2.9°
Total Length of Main TubeCassegrain: 855mm
Newtonian: 855mm
Total weight of Main TubeCassegrain: 8.5kg (18.7lbs)
Newtonian: 8.5kg (18.7lbs)
Finder ScopeCassegrain: 7x50 6.3°
Newtonian: 7x50 6.3°
  
 
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