Product Highlights
The Takahashi CCA-250 Tri-Focal Astrograph functions at f/5, f/8,
and f/3.9 (with 6345 Flattener) and has an aperture of 250 mm (9.84") The CCA-250 Tri-Focal Astrograph was produced by Takahashi to replace the Baker Ritchey Chretien BRC-250 The CCA-250 rear assembly includes a large camera rotator and can operate an electric rotator for remote operation The
CCA-250 Tri-Focal Astrograph Modified Cassegrain design includes a
carbon fiber tube allowing for light weight and stable focus The CCA-250 by Takahashi has a D-series (Losmandy) -compatible dovetail for easy mounting Designed to replace the Takahashi Baker-Ritchey Chretien BRC-250, the
Takahashi CCA-250 Corrected Cassegrain Astrograph takes its place among
the stars as the latest visual and astrophotogic instrument. With
built-in electric focus, the Takahashi CCA-250 Astrograph allows use of
software to ensure 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-250 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 formula of the new design. With the automatic focusing
function of control application “Focus Infinity” 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.
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
Specifications
SKU TK-CCA250P
Telescope Series
Takahashi BRC/ FRC
Optical Design
Modified Cassegrain
Mount Type
None - Optical Tube Only
Warranty
5 Year Warranty
Telescope Aperture
9.8"
Secondary Aperture
125mm
Telescope Focal Length
1250mm
Telescope Focal Ratio
f/5
Back Distance
193.5mm
Image Circle
88mm
Image Across Field
2 microns RMS-spot radius on axis : 3 microns RMS-spot radius 10m off-axis : 3 microns RMS-spot radius 20m
Optical Coatings
Aluminum
Limiting Stellar Magnitude
14.5
Highest Useful Magnification
Not supplied by manufacturer
Optical Tube Outer Diameter
306mm
Length of Optical Tube
34.25"
Optical Tube Weight
50.16 lbs.
Tube Color or Finish
Gloss Black
Finder Included
None
Eyepiece(s) Included
None
Diagonal Included?
No - Sold Separately
Dew Shield Included?
No, Sold Separately
Dew Shield Outside Diameter
Not supplied by manufacturer
OTA Mount Type
N/A
Power Adapter Included
DC Cable with Alligator Clips
Objects in Database
N/A
Hand Controller Included?
Yes
Alignment Procedure
N/A
Counterweights Included
N/A
Mount Weight
N/A
Total Telescope Weight
50.16 lbs.
Tripod Type Included
None, Sold Separately
Telescope Specifications
CCA Photo Visual System Chart
CCA 645 Reducer-CA System Chart
CCA Reducer-CR System Chart
CCA Extender System Chart
In the Box Takahashi CCA 250 mm Tri-Focal Astrograph Telescope OTA Includes a carbon fiber tube assembly Large camera rotator assembly Includes integrated D-series compatible dovetail for easy mounting
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