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 |
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 Carbon Fiber Tri-Focal Astrograph Telescope OTA
- Large Camera Rotator Assembly CCA TKP86200
-
Coupling (TW) TKP86003
- Coupling (S) TKP00103
- Aux. Ring TKP86002
- Ocular adapter (31.7) TKP00101
- Visual adapter TKP86005
- Integrated Losmandy-Style Dovetail
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