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

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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. )Rr+bCi0W$?(`~p

aL)D3I*[#x CASSEGRAIN MODE `$U
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q!hYB$R.~.I9GP j 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.
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eHTT@^E'e6@ MODE SWITCHING
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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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GENERAL /V3WR5X:A.{'}

-R HO0cpB6@O 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.
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u#\K[X 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. ?'W)t/xXo7su0?)Lf:^Z
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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.
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d;ag8k} hVbvx9] SPECIFICATIONS
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S9O}j+@ Primary Mirror Diameter: 12.5"/315mm
n z)D(q'}WQX @0P Focal Length, Newtonian Mode: 50"/1.3mm s2[Q|V a*Ai
Focal Length, Cassegrain Mode: 150"/3.8m 3G(vUpW5~ZVF+B
Focal ratio: f/4 Newtonian; f/12 Cassegrain
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p3qt7\e` f/4 Secondary mirror: 4"/102mm
l0is"jh f/12 Secondary mirror: 3.5"/89mm
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cv?(bN*G Focuser: 2" with 1.25" adapter; 3" of travel P:J5eb7j o
Finderscope: 8x50 finderscope qY1Bh3w4I3?3zX
Tube OD: 16.3"/42cmm
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A2p Tube length: 50"/1.3m
Ne)v]nN Shipping Weights ~1rP T8QnHM
OTA: 85 lb/40 kg 1|HlvL0@ j }S~
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Counterweight: 60 lb/27 kg #g&G/Fc7s^ k
Mount: 125 lb/57 kg