查看完整版本: Parks Optical Telescopes是最好的反射镜吗

Parks Optical Telescopes是最好的反射镜吗

NEWTONIAN MODE
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The ultra fast, rich-field (f/4) reflector mode combines large aperture and a wide field of view to deliver breathtaking views of globular clusters, open clusters, nebulae and galaxies. This mode is perfect for deep sky visual and photographic applications. Astro-photographers will appreciate the extremely fast photographic performance the f/4 design delivers. f*]3C4Zw

"C(j/U:EEZ9B CASSEGRAIN MODE 5k%hDU4W
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The long focal length (f/12) classical Cassegrain mode is ideal for high magnification, high-resolution observing and photography. The Cassegrain mode delivers stunning planetary, lunar, solar and double-star images. *n*^UN;an E
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MODE SWITCHING
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&i9d$Z|;w6GOQ;R4R'v3} Parks HIT Observatory systems are supplied with two secondary mirrors, 180° apart, on a rotating turret. Detents lock either mirror into alignment for desired mode. This switch can be performed in just minutes, without the need for re-collimation.
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All mirrors are ground, polished, and hand figured completely in-house for diffraction-limited results. The optics are mounted in a genuine Parks low thermal conductive fiberglass tube. The tube provides room around the mirror for air movement without disturbing the images. A large 8x50 right angle/straight-through finderscope is standard, as is a 2" rack and pinion focuser with 1.25" adapter. The primary mirror cell and secondary mirror holder are adjustable for alignment purposes. The rotating ring system allows convenient re-positioning of the eyepiece or camera, depending on the location of the target. I/?He6MNT Ros

5U)dW6~~$i.s)n? New state-of-the-art, low voltage 12 VDC clock drive/drive corrector runs anywhere in the world without changing the motors or circuitry. Using less than .5 amps at 12 volts, the dual-axis drive corrector can be selected to run at lunar, solar or sidereal rates. Declination motor, declination reversing switch, and dual-axis hand control unit are included. +WB2D
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*N(b(w(s)W$QL| Also new is a spring loaded, quick release, anti-backlash declination tangent system with manual and electronic slow-motion tracking capabilities. The worm and gear are both lapped to increase accuracy, and are individually matched. A spring-loaded worm gear assembly assures 100% interfacing of the gears for superior accuracy. /G.zX!`(oW+d2ni

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Primary Mirror Diameter: 12.5"/315mm ;_ @VZ
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Focal Length, Newtonian Mode: 50"/1.3mm
&V7l}kEZ]x Focal Length, Cassegrain Mode: 150"/3.8m
k E#Xswl?f Focal ratio: f/4 Newtonian; f/12 Cassegrain eDD|$au|.c ^
f/4 Secondary mirror: 4"/102mm
?'I/jl)CI.]*t f/12 Secondary mirror: 3.5"/89mm
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Focuser: 2" with 1.25" adapter; 3" of travel 3p*oP9s+qw"jue
Finderscope: 8x50 finderscope
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Tube length: 50"/1.3m WpL,`}
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Shipping Weights
w+`1F#i;i%o$y OTA: 85 lb/40 kg
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c'NB8}&R Counterweight: 60 lb/27 kg
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e Mount: 125 lb/57 kg

“All mirrors are ground, polished, and hand figured completely in-house for diffraction-limited results “。光靠这句话不行，第三方的检测报告在哪里？

They are OK scopes bb34

Wbhifi兄，这款在70、80年代还很著名的美国望远镜生产商，质量不错但比不上同期的Cave反射镜，而且上面所看的规格也真是很古老了吧?

bbbb3 菠萝牌的才是最好的

[quote]原帖由 [i]王猛龙[/i] 于 2008-8-26 10:56 发表 [url=http://www.astroview.com.cn/redirect.php?goto=findpost&pid=68330&ptid=6867][img]http://www.astroview.com.cn/images/common/back.gif[/img][/url] Y)]7RLq
bbbb3 菠萝牌的才是最好的 [/quote]0om8g1B @O
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菠萝牌?!

[quote]原帖由 [i]galaxykid[/i] 于 2008-8-26 02:31 发表 [url=http://www.astroview.com.cn/redirect.php?goto=findpost&pid=68296&ptid=6867][img]http://www.astroview.com.cn/images/common/back.gif[/img][/url]
%s/B4|eO Wbhifi兄，这款在70、80年代还很著名的美国望远镜生产商，质量不错但比不上同期的Cave反射镜，而且上面所看的规格也真是很古老了吧? [/quote]v&[Q jhX]
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是比较古老了， 我不太熟悉， 不过Parks optical的东西做工还可以， 有的地方显得过时， 镜子本身的素质还不错。
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但话说回来， 现在国产的镜子（Synta出口）的素质已经超出了很多人的估计了。 至少我个人会毫不犹豫的买再个12“的Orion Dob， 毕竟性价比放在那里。 而且看深空， 镜子素质真的没有那么重要。

要知道Synta已經是全球最大的望遠鏡生產商了。
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我昨天在香港島南區赤柱碼頭測試高橋TOA130及Sky Watcher Equinox 120時，很自豪地告訴人家，這台國產鏡把日本頂級鏡打敗了。

我只知道这个厂家出的镜子都很重