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BAckfocus_of_reducer.pdf (84.2 KB), Download : 30

Reducer and CCD adapter

1.
http://www.takahashiamerica.com/includes/link.htm?target=http://www.takahashiamerica.com/main_tak_ccd.htm&title=Land%20Sea%20%26%20Sky%2C%20Home%20of%20Takahashi

2. http://astronet.co.kr/cgi-bin/zboard.php?id=useful_info&no=146

3. http://astrophoto.co.kr/zeroboard/zboard.php?id=information&no=19

402ME , SBIG 8300  Backfocus 는 17.5mm구먼,

렌즈

니콘: 46.5mm
FD 렌즈 : 42mm
( 뒷뭉치부위이 길이는?? 58.4mm추정..총 100.4mm추정..조리개는 36mm부위에 위치..)

Pentax 67렌즈는 경학님이 84.95mm라는구먼

** LPS p2 filter를 쓰면 backfocus가 짧아집니다. ??? .. 색감이 확틀어지지요 //

CCD
6303 E: 37.3mm
FLI : 0.848+0.877(약 43.8mm ) 6303것 보다 6.51mm 짧게..
ST10+SFW8a: 42.3mm
ST - 402, 8300 Backfocus: 17.5mm
Atik: ??? mm
QHY5 : 12.5mm

Reducer/Flattner
Epsilon 180: 56mm
SKY90 : 72.2mm
TOA 130s : 83.7mm (or 117.5mm??)
AP사의 Photographic-Visual Telecompressor (0.75x) (27TVPH)
: Reducer면에서 175mm가 0.75배 ( FL=700mm)
----------------------------------------------------------------------

Adapter
Epsilon STL Adapter: 18.7mm
* FLI용은 Epsilon FLI adapter는 12.2 mm

ST 10 Adapter: 13.7mm
SKY 90 CA35 : 16.2mm
Wide T-ring : 9.5mm ??? (일반 T-ring은 8.5mm?)

SKY 90 - 2" Adapter :   ..??mm
      with 2" to T-ring : ?? mm

Nikon to C mount adapter: ?? mm(56-17.5??)

T-ring to SLT adapter( short: 10 mm/ 가변: 23~ 25, ??mm)

T-ring 연장통: 12.1mm, 15mm두개.

Pentax 67- Nikon adapter:    .. mm??
Pentax 67- STL adapter:   mm??
AP (27TVPH) -  STL adapter:  ... mm??

ATIK
CCD camera의 backfocus?
http://www.atik-instruments.com/html/downloads.html

AP사의 Photographic-Visual Telecompressor (0.75x) (27TVPH)  는 ??

The focal length of the 27TVPH Photo-Visual Telecompressor is 700mm or 27.6". Using the formula above, a distance of 175 mm or
6.9" gives the stated 0.75X compression. (700 - 175) / 700 = 0.75 A shorter distance of 140 mm would give a compression factor of
0.80X. (700-140) / 700 = 0.80.
For your calculations, the 27TVPH takes up about 57 mm or 2.25" of that distance. The rest is made up of extensions, adapters,
camera backfocus etc. To achieve 0.75X compression then, you would need a total distance of 118 mm (175 - 57) or 4.6” from the
back edge of the telecompressor body to the focal plane.
The 27TVPH also has a clear aperture of 56 mm. To get the size of the fully illuminated (non-vignetted) circle, simply multiply the clear
aperture times the compression ratio that you ended up with in the calculation above. 56 mm x 0.75 = 42 mm at 0.75X compression;
56 mm x 0.80 = 45 mm at 0.80X compression. Remember, however, that other parts of your light path like T-rings or filters may restrict
the clear aperture further.
As a further example, let’s assume a digital SLR is being used. The distance from the camera’s bayonet mount to the sensor chip is
44 mm. The least amount of compression you can expect would be to use the following: Start with the 27TVPH @ 57 mm; no
extensions; the ADA20132 - 2" thin adapter @ 11 mm; the AP16T - 2" / T2 nosepiece @ 3 mm; the appropriate T-ring at 10 mm; and
finally your digital SLR @ 44 mm. 57+11+3+10+44=125 mm. (700-125) / 700 = 0.82X of compression. 56 x 0.82 = 45.9 mm - the
fully illuminated circle. Adding extensions or using longer components like the regular 2" adapter (ADA2003) or the PFCT camera
adapter instead of the AP16T will increase the amount of compression and decrease the fully illuminated circle accordingly. (Note, the
example uses the newer ADA20132 with the AP16T. We do not recommend using the older style ADA2013 with the AP16T nosepiece,
but instead suggest the equivalent Baader BP16 nosepiece.)

12" SCT with band: 20KG
1600mm guide: 4KG
CCD: 4Kg : 28KG

Epsilon 180 + Band : 15KG + Camera 2 KG:
미동운대 ( 3KG ) + 300mm CCD: 6KG : 26KG.

http://cafe.naver.com/jjunahe333.cafe?iframe_url=/ArticleRead.nhn%3Farticleid=312

1. AP 1200
   + Epsilon 180 + D3? + Finder(30mm)
   + 300mm & TGM1)  + 300mm(FLI)

2. Gemini 42
  + 12" SCT + Eyepiece (안시)
  + 1500mm Guide scope + 402
   (  Pentax lens(165mm이하) + FLI )

3. NJP (  집옥상 )
+ TOA + Eyepiece ( or 10XE or )
+ Guide ( FD 400mm + QHY5 )

4. EM200 -> 수리요망후 판매?? : No touch!!
    Sky 90 + eyepiece( or 10XE)

5. Giro 2 Dx : Miyauchi + kenko SE120 ( or Vixen 80mm )

이덕수 2010/05/12

뭐시기 인지는 잘 모르겠지만... 장비 뽐뿌글이죠???


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