= = 高桥的RC
http://www.buytelescopes.com/images/thumbs/0037743_400.jpegThe FRC-300 is a flat field Ritchey-Chretien produced by Takahashi.
This newest flat field astrograph is designed to produce a flat 90Ø image circle for medium format photography or CCD imagery. This image circle can be used with the largest available CCD cameras for many years to come. The f/7.8 focal ratio enables the imager to produce images of smaller objects with amazing sharpness and contrast.
The pin-point stars 10 microns at the edge and 2348mm focal length produce a field, free of astigmatism or coma, will allow the FRC to resolve star clusters and fine detail in galaxies and nebulae across the entire 90mmØ circle.
The temperature compensated secondary holder insures pinpoint stars during long exposures.
The dedicated f/5.9 reducer produces a 36mmØ flat circle for CCD imaging at this shorter focal length.
SPECIFICATIONS
Optical System: Corrected Flat-field Ritchey-Chretien
Uses: CCD or medium format astrophotography
Diameter: Ø 300mm
Secondary: Ø 125mm
Focal Ratio: f/7.8
Image Circle: Ø 90mm
Focal Length: 2348mm
Focal Length (with reducer): 1770mm
Focal Ratio (with reducer): f/5.9
Image Circle (with reducer): Ø 36mm
Tube Diameter: Ø 324mm
Tube Length: 1030mm
Finder Scope: 7x50 6.3°
Tube Weight: 30kgs / 66lbs
毒啊,毒啊。。。。。。。。。。。 FRC-300 高橋 歷史上的 第二支 RC 作品 (第一支是 BRC-250)...
廣受 天文攝影人士的愛用, 尤其是在 北美地區...
RC 光學系統 因為 製作較為麻煩, 所以價格都很高...
::070821_18.jpg:: 回复 3# edward0102
在下最近几个月内可能会入10W块的设备。。。求杨斑竹推荐。。。
预期购入 TOA130(4寸调焦座)+ EM4002M 回复edward0102
在下最近几个月内可能会入10W块的设备。。。求杨斑竹推荐。。。
预期购入 TO ...
stuxaria 发表于 2011-7-8 15:28 http://www.astronomy.com.cn/bbs/images/common/back.gif
TOA-130 + EM-400 Temma 2M... 10W 是不夠的...
若 赤道儀 改用 EM-200 Temma 2M 那就 綽綽有餘, 還可以 依需求加配些配件...
::070821_18.jpg:: 回复 5# edward0102
可能有个10-12W吧。。。我在美国,TOA130+EM400可以109000左右到手,不过加上三脚架和一两个目镜估计就到头了。。。 回复edward0102
可能有个10-12W吧。。。我在美国,TOA130+EM400可以109000左右到手,不过加上三脚 ...
stuxaria 发表于 2011-7-10 02:27 http://www.astronomy.com.cn/bbs/images/common/back.gif
原來 LZ 是在 北美... 這個配置 是不錯的~ 日後 赤道儀上 除了 導星設備 外,
還可以 "同架" 其它鏡筒及鏡頭...
::070821_18.jpg::
一次可以搞定多種作品~ 8 錯 8 錯~~ ::070821_09.jpg:: ::070821_09.jpg::
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