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다카하시 OTA Metal back spec

by Starholic posted Nov 09, 2009
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크게 작게 위로 아래로 댓글로 가기 인쇄

다카하시 제품의 경우 특이하게 Metal back 이라는 용어를 사용합니다.

말그대로, 플래트너/리듀서 링의 끝에서 부터 거리를 의미하는 것으로,  기존 다른 곳의 distance 개념보다 계산하기 쉬워집니다.

아래엔 없지만 E-180ed 도 56mm 의 metal back distance 를 가지고,  공고롭게도 많은 장비들의 M/B이 56mm 로 나타나네요.
(포터블한 입실론 시리즈들은 다 56mm 입니다.  MT160도 리듀서 이용시 56mm)


Takahashi Back Focus Guide for CCD and Photographic Applications


Model - Focal Ratio
Focal length - metal back distance
Reducer F-ratio · focal length · metal back distance
Flattener focal ratio · focal length · metal back distance
FC-50 . f/8.0
400mm
f/5.8 · 290mm · 55.0mm
n/a
FS-60C . f/5.9
355mm . 143.9mm
f/4.4 · 264mm · 56.0mm
f/6.2
FC-60E . f/8.3
500mm . 173.5mm
f/6.3 · 380mm · 60.7mm
n/a
FC-65 . f/7.7
500mm
f/5.9 · 380mm · 60.79mm
n/a
FCT-76 . f/6.4
487mm
f/4.5 · 345mm · 72.8mm
n/a
FS-78 . f/8.1
630mm . 165.9mm
f/6.1 · 474mm · 72.3mm
n/a
FSQ-85ED . f/5.3
450mm . 200mm
f/3.86 . 328mm . 72.2mm
f/8.0 . 675mm . 117.5mm
FCL90 (SKY-90) . f/5.6
500mm . 170.5mm
f/4.5 · 407mm · 72.2mm
same
FCT-100 . f/6.4
640mm
f/4.6 · 460mm · 76.95mm
n/a
FS-102 . f/8
820mm . 194.5mm
f/6.0 · 614mm · 83.9mm
n/a
FSQ-106 f/5
530mm · 120mm
 
 
FSQ-106ED f/5
530mm . 178mm
f/3.6 . 385mm . 72.2mm
f/8.0 . 850mm . 117.5mm
FC-125 . f/5.6
705mm
f/5.9 · 740mm · 134.5mm
n/a
FS-128 . f/8.1
1040mm . 198.78mm
f/6.0 · 770mm · 83.9mm
n/a
FS-128F . f/8.1
1040mm . 218.5mm
f/6.0 · 770mm · 106.2mm
f/8.2 · 1055mm · 106.2
FCT-150 . f/7.0
1050mm . 309mm
f/5.0· 750mm · 102.45mm
n/a
FS-152 . f/8
1216mm . 218.5mm
f/6.0 · 774mm · 106.2mm
f/8 · 1223mm · 106.2
BRC-250 f/5
1250mm · 106.2mm
n/a
n/a
FRC-300 f/7.8
2348mm · 106.2mm
f/5.9· 1770mm · 83.7mm
 
TOA-130 . f/7.7 2.7" focuser
1000.0mm · 200.0mm
f/5.79 · 780mm · 83.7mm w/TOA Reducer 
f/5.6 . 728mm . 106.2mm w/Super Reducer 
f/7.5 . 980mm . 117.5mm w/TOA-130 FN
TOA-130 . f/7.7 4" focuser
1000.0mm · 200.0mm
f/5.79 · 780mm · 83.7mm w/TOA Reducer 
f/5.6 . 728mm . 106.2mm w/Super Reducer
f/7.7 . 1000mm . 106.2mm w/TOA-130FF
TOA-150 . f/7.33
1100mm . 214mm
f/5.7 . 860mm . 106.2mm w/TOA Reducer
f/5.5 · 825mm · 106.2mm w/Super Reducer
f/7.3 . 1090mm . 106.2mm w/TOA-130FF
TSA-102S f/8.0
816mm
f/5.98 · 610mm w/TOA Reducer
f/7.84 . 800mm w/TOA Flattener
E-130 . f/3.3
430mm · 56.0mm
 n/a
 
E-160 . f/3.3
530mm · 56.0mm
 n/a
 
E-200 f/4.0
620mm · 59.8mm
  n/a
 
E-210 . f/3.0
628mm · 62.8mm
 n/a
 
E-250 . f/3.4
854mm · 84.2mm
  n/a
 
E-300 . f/3.8
1130mm · 122.0mm
   n/a
 
E-350 . f/3.6
1248mm
   n/a
 
M-180 . f/12.0
2160mm . 133.0mm
 
f/9.8· 1763mm · 56.0mm
M-210 . f/11.5
2415mm · 162.0mm
 
f/9.3 · 1961mm · 56.0mm
M-250 . f/12.0
3000mm · 150mm
 
f/9.3· 2328mm · 56.0mm
M-300 . f/11.9
3572mm · 107.5mm
 
f/9.1 . 2739mm . 56.0mm
CN-212 . f/12.4
2630mm · 154.0mm
f/9.9 · 2105mm . 56.0mm
 
CN-212 . f/3.9
820mm · 56.0mm
 
 
MT-130 . f/6.1
795mm . 91.0mm
f/4.8 · 618mm · 56.0mm
*f/8.2 · 1060mm · 61.0mm
MT-160 . f/6.3
1000.0mm . 93.0mm
f/4.9 · 776mm · 56.0mm
*f/8.3 · 1330mm · 61.0mm
MT-200 . f/6
1200.0mm . 87.0mm
f/4.9· 970mm · 56.0mm
*f/8.0 · 1600mm · 61.0mm
EXTENDER-Q 1.6X
125mm
 
 
EXTENDER-TOA 1.6X
117.5mm
 
 

 

*Extender/Flattener

The metal back distance is measured from the point at which the end of the reducer and the camera adapter come together, hence the name "metal back".

Takahashi has measured these distances for optimum performance for photographic or CCD applications.