Takahashi© Apochromatic Refractor 高橋復消色差折射望遠鏡
TOA-130 | FCT-150 | FCT-200 | FCT-250

Takahashi© China


高 橋 中 國



Telescope 望遠鏡 
FS-60C | FS-78 | FS-102 | FS-128 | FS-152 | FSQ-106 | Sky-90  
  TOA-130 | FCT-150 | FCT-200 | FCT-250
μ-180 | μ-210 | μ-250 | μ-300
MT-130 | MT-160 | MT-200 | MT-250 | MT-300
ε-160 | ε-210 | ε-250 | ε-300 | ε-350
CN-212 | BRC-250 | BRC-300 | C-300 | C-400 

 Equatorial Mount 赤道儀
TG-SP 2 | Space Boy | P2-Z | EM-2S | EM-10USD3 | EM-200USD3 | NJP | EM-500
EM-10 Temma 2Jr | EM-200 Temma 2Jr | EM-200 Temma2 | NJP Temma2 | EM-500 Temma2 
EM-2500 Temma-PC | EM-3500 Temma-PC 
Accessory 附件 | Price List 價目表

 Brief history of telescopes 望遠鏡簡史

Specification of telescopes at a glance 望遠鏡規格一覽


TOA-130    
Triplet Ortho-Apochromat (無畸變復消色差三合透鏡)

The latest Takahashi refractor, the triplet TOA-130, is the first of the new Ortho-Apochromat Series. This 21st century innovation employs a newly designed triplet using special elements to produce the highest order of color correction, hence the name Ortho-Apochromat and is packaged in a short 32” tube with the lens shade retracted. This instrument will be offered with the classic 2.7” focuser. The high order of color correction of the Ortho-Apochromat Series produces images with saturated color and thanks to the numerous knife-edged baffles, an image with amazing contrast. The model with 4" focuser specialized for astrophotography is also available. The TOA-130 is perfect for visual, CCD and photo imaging. The f/7.7 focal ratio with a 1000mm focal length is long enough, using the LE-ED 2.8mm Takahashi eyepiece, for high magnification observations of the Moon and planets and yet will produce a 2.5° field at 20x when used with the Takahashi flat field LE-50 2 “ eyepiece, with an additional 0.75x reducer, at 750mm f.l. and 15x, a field of 3.3° will be reached. Ample back focus, over 256mm from the back of OTA, has been designed in to permit the user to use a variety of CCD cameras, color filter wheels and electronic focusers or film cameras.　
  流囇口水啊!?         tempting!?  
 
TOA-130 optical tube assembly
4" focuser model available

　

Concept

As for many of the advanced refracting telescope which presently is sold as the ED (the Extraordinary Dispersion anomalous dispersion glass is used), achromatic means using two different refractive index optical glass used to eliminate chromatic aberration,  which will not completely eliminated. If large portion of fault of aberration of the refracting telescope is chromatic aberration and chromatic aberration is gone completely, there is no cover in the opening different from reflection, it becomes non cover and non aberration optical system, to the diffraction limit by the aperture it becomes the ideal telescope. But when there is an axial over tone aberration and a spherical aberration of color in chromatic aberration of the refracting telescope and the compact thinking, it makes the lens where the F is bright, every color (every wave length) the bending of spherical aberration will become large, especially blue (the F line) to purple (the g line) wll be  increasing, contrast had decreased. As for the ED and fluorite lens, the refractive index is low, there was a tendency where in the lens of the secoondary  and 3rd aberration still occurs, furthermore spherical aberration of every of wave length becomes reduced.
With the Orthoscopic Apochromat, complete separated system (3 elements 3 groups), if separating 3 lenses which include 2 anomalous dispersion glass at optimum spacing, resulted in the whole spectrum with evenly correction of aberration. At F/ 7~8, the spherical aberration can be corrected perfectly.
The TOA -130 from the g line of the wave length 436nm to the C line of the 656nm at total wave length of visible light the gap of focal length has been settled within to positive or negative 0.01mm peak to peak at the aperture 130mm focal length 1000mm.
With wonderful effect on aberration correction, which is only of approximately 1/100 of the conventional apochromats telescope, it has reached the aberration quantity which is much smaller than the catadioptric system where correcting lens system applied. In addition, the secondary aberration is so low throughout the ultraviolet ends to the infrared ends, thus will be an ideal astrograph for the cooling CCD systems.

                                     chromatic aberration curve
   
                                                                      spherical aberration curve

　

When applying the of 2 different lens elements, the TOA -130 optical efficiency attains highest. Very small central aberration from the focus falling, it reaches 2.9 microns at centre, but it has been less than the diffraction limit much, it deteriorates from central for very small amount. From the center to around 35mm size off axis 40mm within 8 microns of diffraction limit, to the  70mm off axis at light intensity 100% to the 80mm off axis within 15 microns and around the 6×7 it becomes non aberration optical system at light intensity 85% almost 20 microns over the entire field. Thanks to the lens back focus has guaranteed to 135mm (5.3"), also the installation of various observation equipment such as bino view and adaptic optics with the diagonal mirror is possible. The optical system is most reliable and excellent in applying with the cooling CCD of the large format size which is the main stream in the future imaging technique.

　      TOA-130 advertisement in Temmon Guide   TOA-130在天文Guide的廣告
                                                                             1 | 2 | 3  

D, C, F, G : 4 wave length analysis / magnification  200 X / F.L. = 999 (F / 7.7)


TOA-130 67 flattener             

　

Specification for TSA-130 高橋三合透鏡無畸變復消色差望遠鏡規格 (Takahashi Orthoscopic Apochromat)
Configuration 組態 Triplet三合透鏡
Aperture 口徑

130mm
Focal length 焦距

1000mm
Focal ratio 焦比

F/7.7
Resolution 解像度 0.89 arc second
Limiting magnitude 極限星等 12.3
Light gathering power 集光力 345X

Focal length w/ reducer 用縮焦器時焦距

754mm

Focal ratio w/ reducer 用縮焦器時焦比

F/5.8

Image circle 影像圈

52mm(60% illuminated)
25mm (100% illuminated) 

Photographic field 攝影視場

 3.8° 

Star image at the centre 視場中心星像大小

1 micron

Star image at the edge 視場週邊星像大小

15 micron

Finder scope 尋星鏡

7x50 6.3°
Focuser 調焦器

68mm (2.7")

Back focus from 2" adapter/ end of OTA  2"接環後焦距/ 鏡筒本體末端

160mm/ 256mm

Length of the main tube with dew shield extended 露罩伸長時主鏡筒長度

1120mm
Length of the main tube with dew shield retracted 露罩縮短時主鏡筒長度

990mm
Length of the main tube only 812mm

Diameter of the dew shield 露罩外徑

179mm
Weight of the main tube assembly 主鏡筒組重量

10kg


TOA-130S Photo/Visual System Chart
 TOA-130F Photo/Visual System Chart


　
FCT-150 Fluorite Apochromat: The reference standard telescope
FCT-150 螢石復消色差折射望遠鏡: 參考標準望遠鏡


The FCT-150's no-compromise design features Japanese lens elements to produce the finest telescope of its kind in the world. The FCT-150 incorporates the highest quality fluorite, innovative baffling, and superb mechanical craftsmanship. It provides the highest contrast images to be seen in any refractor currently available, at any price. Subtle lunar and planetary images will be visible, as well as the fine filamentary detail in nebulae.

With a focal length of f/7, the FCT-150 is perfect for producing the finest astrophotos

Specification for FCT-150
Optical System Fluorite Apochromat Doublet
Coating Front Full-Multi-Coated
Aperture 150mm
Focal Length 1050mm
Focal Ratio F/7.0
Resolution .78"
Light Grasp 459x
Limiting Magnitude 12.7
Image Circle Ø63mm
Photo Field 4.8° w/reducer
Tube Diameter Ø166mm
Tube Length 1150mm
Weight 22kg (48.4lbs)
Finder Scope 11x70 4.2°












Horsehead Nebula
馬頭星雲


Lagoon Nebula

  

FCT-150+FSQ-106+NJP


FCT-200 Fluorite Apochromat: The largest manufactured refractor available commercially
FCT-200螢石復消色差折射望遠鏡: 最大的量產折射望遠鏡





The FCT-200 Fluorite Apochromatic refractor is the second largest Fluorite Apochromatic refractor manufactured by Takahashi©.

The FCT-200 features the finest optical elements available in the world today. The front and rear elements employ the highest quality German optical glass and Japanese Fluorite for the center element.

All elements are hard multi-coated for maximum light transmission.

EM-3500 maximum loading 150kg, GOTO capability, slewing speed 700x of sideral rate 


Specification for FCT-200
Optical System Fluorite Apochromat Triplet
Aperture 200mm
Focal Length 2000mm
Focal Ratio f/10.0
Light Grasp 816x
Resolution .58"
Limiting Magnitude 13.3
Image Circle Ø65mm
Photo Field (w.reducer) 2°
Tube Diameter Ø256mm
Length of Tube 2300mm (90.55in.)
Weight 62.1kg (137lbs)
Finder scope 11x70, FS-102











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