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Used Takahashi CCA250 Corrected-Cassegrain Astrograph - UT-12995 -SOLD-

ITEM #
UT-12995
  • Price:
  • Sale
  • $11,495.00
  • Regular price $18,459.00

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Accessories Added

  • This is a used telescope in excellent condition*

DESCRIPTION

Used Takahashi CCA250 Corrected-Cassegrain Astrograph - UT-12995 -SOLD-

Introduced in 1998, the BRC-250 astrograph adopted a totally original optical design, based on Baker-Ritchey-Chrétien, perfectly designed for the imagery at that time. Following the recent evolution of CCD cameras offering larger sensors, Takahashi decided to modify its optical design. To work out this new CCA-250, successor of the BRC-250, the optician engineer Mr Mori Hitoshi opted for a Cassegrain base to lead to this new instrument perfectly adapted for the various objects of the deep sky.

CCA-250 (CCA stands for Corrected Cassegrain Astrograph) offers 3 kinds of focal lengths by the addition of optional reducers and extenders. From F/5 standard focal ratio at primary focus, it is possible to go to F/3.6 by using one of the 2 reducers or to go to F/7.5 by using one of the 2 extenders available. The choice of the model of reducer and extender will depend on the image circle needed, but also according of the size of the sensor of the camera used.

Finally Takahashi carried out a very multi-purpose astrograph offering a extremely high standard product bringing a great optical quality as well as irreproachable mechanics on top of which is added a splendid design associating aluminum and carbon.

Takahashi has chosen a modified optical design based on Cassegrain telescope, with a parabolic primary mirror, a spherical secondary mirror and a neutral field corrector. Collimation is perfectly maintained by using the whole adjustment of the spider instead of having to adjust the secondary mirror. 

The main result of this formula is a real increase of the back focus (compared to that of the previous BRC-250), allowing many different possibilities and assemblies, of including those of correctors and reducers. Those will offer you an extreme flexibility to the different possible configurations, neither equipped with a camera with a large sensor or not

Optical design Modified Cassegrain
Diameter of the primary mirror 260mm (Useful aperture : 250mm)
Features of the primary mirror 260mm, Pyrex parabolical mirror, F/2.75
Features of the secondary mirror 125mm diameter, Pyrex spherical mirror
Mirror coatings Protected high reflectivity
Obstruction 0.58
Corrector 3 lenses, 80mm diameter
Lens coatings Fully multicoated
Back focus (BFL) 193.9mm (without CAA)
155.4mm (with CAA)
Resolving power 0.47"
Limiting magnitude (visual) 14.1
Clarty 1792x

SPECIFICATIONS

ConditionExcellent
ManufacturerTakahashi

INCLUDED ITEMS

  • Takahashi CCA250 optical tube
  • Integrated heavy duty dovetail/ring assembly
  • Losmandy size dovetail saddle
  • Large camera rotator
  • 7X50 finder and bracket
  • Extension tube set
  • 645-RD reducer .72X
  • Extender-CR 1.5X
  • CCA 250 instruction manual
  • Original box and packaging
  • * The mirrors of this scope are new, not just recoated and were installed by Takahashi in Japan. The interior of the scope has been resprayed with optically flat paint. The are a couple of dings in the carbon fiber but both buffed out fine. Both the reducer and extender shows marks from normal use but optics are clear and clean. Scope is collimated to factory specifications *