Takahashi CCA-250P Tri-Focal Astrograph Telescope OTA, Corrected Cassegrain $16,795.00,  Takahashi TCCA250,Optical Tubes (OTA) Telescopes, Top Selling
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TAKAHASHI CCA-250P TRI-FOCAL ASTROGRAPH TELESCOPE OTA, CORRECTED CASSEGRAIN TCCA250

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Takahashi CCA-250P Tri-Focal Astrograph Telescope OTA, Corrected Cassegrain

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Takahashi CCA-250 Corrected Cassegrain Astrograph Telescope OTA, 250mm f/5, TCCA250

Item No. 611-50570
Manuf. No. Takahashi TCCA250

Special Order Item Please read terms page before placing order

Takahashi CCA-250P Tri-Focal Astrograph Telescope OTA, Corrected Cassegrain, TCCA250

The CCA-250P Telescope was designed to replace the Takahashi Baker-Ritchey Chretien BRC-250, the new Takahashi CCA-250P Tri-Focal Astrograph takes its place among the stars as the latest visual and astrophotogic instrument.

With built-in electric focus, the Takahashi CCA-250P Tri-Focal Astrograph allows use of software to enusre perfect focus... and a large camera rotator can make use of an electric rotator for remote operation.

Able to operate at three different focal lengths - f/5, f/3.9 (with 6345 Flattener) and f/8 - this new design makes use of today's modern big chip cameras. Add a carbon fiber tube to the equation for light weight, stable temperature operation and excellent focus and you have the new Takahashi CCA-250P Tri-Focal Astrograph!

With the [Takahashi] Active Focuser system which installs the stepping motor for focus adjustment in rear side of the secondary mirror, the focus adjusting is done by electromotion. Depending upon this system, automatic focusing of the digital equipment became possible.

By the fact that drive is installed in the tube, the number of cables which become troublesome is decreased. When using automatic focusing function, it connects with the personal computer, and the USB cable from control software Focus of attachment Infinity controls.

Because you prepare also the driver of ASCOM correspondence, also the control from of FocusMax and MaxIm DL and the like is possible. It operates, the power source of DC12V is necessary.

Around the principal mirror and inside the tube, temperature of the air is measured with the sensor, when temperature difference of the section is large, in order the ope air temperature to adapt quickly, 3 inhalation fans lead the air to the principal mirror. Be able to set the operation setting of ON and OFF, from Focus Infinity, 3 fans it controls under the conditions which are set. Even with button operation of drive the fan it CAN TURN ON and CAN TURN OFF. The inhalation fan, in order not to become the interference of photographing, has used the vibrating fan low.

As for the tube, being lightweight, thermal expansion almost has used the domestic carbon tube which is not. Loading to equatorial is not tube band system, is [arigata] [arimizo] formula of the new design.

With the automatic focusing function of control application ıFocus Infinityı of attachment, the focus adjusting of the photographing equipment being automatic with operation from the personal computer, it is possible. Drive and the personal computer are connected with the USB cable, the picture from the camera is captured, optimum focus position is searched. Other than the focus adjusting, it can operate convenient function such as control of the fan and setting of pre-setting position of 3 places with the personal computer of labor assistant. * Only one for Windows.

Takahashi CCA-250P Tri-Focal Astrograph Features

  • Optical performance: 2 microns RMS-spot radius on axis
  • Image circle: 88mm diameter (60% illuminated)
  • Image angular: 4 degrees diameter
  • Back focus/metal back: 155.4mm -193.9mm with CAA removed
  • Electric focus secondary computer controlled
CCA-250

Mechanical Specs

  • Diameter of main tube: 306mm
  • Diameter of dew shield: 321mm
  • Length of main tube assy: 855mm
  • Weight of main tube: Approx: 20kgs
  • Material of tube: Carbon fiber
  • Electric focus secondary computer controlled
Optical Specs
  • Aperture: 250mm
  • Central Obstruction: 58%
  • Focal length: 1247mm
  • Focal ratio: f/5.0
  • Optical performance:
    2 microns RMS-spot radius on axis
    3 microns RMS-spot radius 10mm off-axis
    3 microns RMS-spot radius 20mm off-axis
    4 microns RMS-spot radius 30mm off-axis
    6 microns RMS-spot radius 40mm off-axis
  • Image circle: 88mm diameter (60% illuminated)
  • Image angular: 4 degrees diameter
  • Back focus/metal back
    155.4mm
    193.9mm with CAA removed
Primary Mirror
  • Diameter: 260mm
  • Aperture: 250mm
  • Focal ratio: f/2.75
  • Shape: Parabola
  • Material: Pyrex
  • Coating: Enhanced multi-layer aluminum
Secondary Mirror
  • Diameter: 125mm
  • Shape: Sphere
  • Material: Pyrex
  • Coating: Enhanced multi-layer aluminum
Conversion Lens Group
  • Diameter: 80mm
  • Number of lenses: 3
  • Coating: Broadband multi-layer anti-reflection coatings BRC-250P Conversion Lens Group
    • 645 Reducer 0.72X
    • Focal length: 898mm
    • Focal ratio: f/3.6
    • Optical performance:
      4 microns RMS-spot Radius On axis
      4 microns RMS-spot Radius 10mm off-axis
      5 microns RMS-spot Radius 20mm off-axis
      6 microns RMS-spot Radius 30mm off-axis
    • Image circle: 60mm diameter (60% illuminated)
    • Image angular: 3.8 degrees diameter
    645 extender 1.6X
    • Focal length: 1970mm
    • Focal ratio: f/7.9
    • Optical performance:
      10 microns RMS-spot radius on axis
      10 microns RMS-spot radius 10mm off-axis
      10 microns RMS-spot radius 20mm off-axis
      13 microns RMS-spot radius 30mm off-axis
    • Image circle: 60mm diameter (60% illuminated)
    • Image angular: 1.7 degrees diameter
    Reducer-QE 0.73X
    • Focal length: 910mm
    • Focal ratio: f/3.6
    • Optical performance:
      4 microns RMS-spot radius on axis
      7 microns RMS-spot Radius 10mm off-axis
      10 microns RMS-spot Radius 20mm off-axis
    • Image circle: 40mm diameter (60% illuminated)
    • Image angular: 2.5 degrees diameter
    Extender-ED 1.5X
    • Focal length: 1885mm
    • Focal ratio: f/7.5
    • Optical performance:
      4 microns RMS-spot radius on axis
      6 microns RMS-spot radius 10mm off-axis
      20 microns RMS-spot radius 20mm off-axis
    • Image circle: 40mm diameter (60% illuminated)
    • Image angle: 1.2 degrees diameter


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