极致藏品:北美QUESTAR Standard 3.5" 天文望远镜 箱/说/附件齐全.机身成色非常新,97%新.
带40-80X以及80-160X目镜 ，最大放大倍率达到160X。 带原配太阳滤镜，原配镜头盖。
此镜光学素质极强,是地球上最极致最顶峰的卡玛式天文望远镜.
功能完美 镜片通透无花无霉
拥有QUESTAR Standard是每一个天文爱好者的一个梦想,二手非产罕见, 如果一辈子只能选择一台镜子,那么毫无疑问,必定是Questar,它已经不只是一台镜子,而是一种文化,一种奢华.
总价: 24800.
手机：18101848400
规格列表:
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TYPE: Maksutov Cassegrain Catadioptric. No coma, astigmatism or spherical aberrations.
CLEAR APERTURE: 3.5 inches, 89mm (Center Obscuration, 27.9mm)
FOCAL LENGTH: Basic Visual 50.5 inches, f/14.4, 1300mm
FOCAL LENGTH: Camera close, 56 inches, f/16, 1400 mm
FOCAL LENGTH: Camera with Ext. Tubes, 64 inches, f/18, 1600mm
FINDER LENS: 4" Fl., 4x and 8x, Field 12° and 8°
POWERS: Powers are eyepiece dependent and can range from 40x to 270x with Questar Brandon eyepieces
POWERS LIMIT: Resolves 1 sec. Arc at 50feet EFL
FIELD OF VIEW: Photographic model, 1°30min, visual field of view 1.1o to .16o
LENS: BK7, MgFl2 coated, passes UV to 3300 A, IR to 1 micron, parfocal
MIRROR: F2, Pyrex®, Zerodur® or Quartz. AlSiO coated 3.800" dia. (All Questars for UV or IR on special order)
SPECIAL COATINGS: On special order, broad-band dielectric coating applied to the mirror, which increases its reflectivity.
To both sides of front lens, a very low reflection coating is then applied which reduces the light loss at
each surface to less than 1/10 of 1%. It transmits all frequencies of the visible spectrum and improves
total light grasp by approximately 22%
EYEPIECES: 24 mm Brandon, 45° ap. Field; 16 mm 4 lens Brandon, 45°Ap. Field, optional eyepieces of
8mm, 12mm, 32mm
AMPLIFYING/BARLOW LENS: Minus 43.9 mm FL
ERECTING SYSTEM: Star Diagonal type, 90° BK7, MgFL2 coated
BARREL ASSEMBLY: Barrel: forged aluminum, machined full length
LENS CELL: Aluminum 24S-T4, black anodized
REAR CLOSURE PLATE: Stainless steel CENTRAL TUBE - precision machining and alignment after assembly.
DEWCAP: Internally black-flocked Synthane seamless tube 1/32" thick, to which is bonded a pre-rolled aluminum
sheet
FOCUSING MECHANISM: Mirror thimble, stainless steel sliding tube. Slides on stainless, fixed, light-baffle
tube, with front-end insert tube of .010" wall thickness. Conical ss spring-loaded. Focus
rod ss 303, ground shaft, 56 T.P.I. precision ground threads
KNOBS: Aluminum 24S-T4, corrosion-resistant, hand-turned on turret lathe, stainless steel shafts and levers
Questar Standard
3.5" Telescope
Specification Sheet
EQUATORIAL MOUNT: Aluminum sand casting, virgin alloy 356-T6 heat treated. Toolroom hand-turned and polished.
Highly corrosion-resistant. Jig-bored and precision threaded for legs. Bottom flange 7" o.d. Fits
tripods with _-20 threads
TURNTABLE OR LOWER FORK BASE: Sand casting same alloy, toolroom turned, jig-bored and precision-reamed, aircraft
polyurethane painted
LEGS: Aluminum 61 S-T3, centerless-ground and threaded, anodized. Center leg adjustable. Butyl rubber tips
SYNCHRONOUS DRIVE MOTOR: _ R.P.M. 110V. 60 cycles, other cycles, voltages and direction of rotation available. Sealed,
lubricated gear train, 2.7 watts
RIGHT ASCENSION GEAR: Bronze, 4" diameter, and 4" diameter teflon-facing bearing surfaces
SIDE ARMS, INNER FORK BRACKETS, CONTROL BOX: Die castings of corrosion-resistant aluminum alloy 13, toolroom
turned, milled, jig-bored, tapped and reamed. Special painted aluminum and clear-urethane protected
FINDER MIRROR CAGE: stainless steel, brushed satin finish
ALTITUDE OR DECLINATION CIRCLE: 3-15/16" diameter, 301 s.s., cemented and riveted to bracket ring assembly, 1o
divisions with etched and filled markings
CLAMP: Bakelite padded s.s. stud clamps dec. circle to side arm
AZIMUTH OR R. A. CIRCLE: 6" diameter, anodized aluminum, silk-screened, graduated to 1o and 4 min of time. May be set as
celestial clock. Manual slow-motion independent of drive
SLOW MOTIONS: Continuous 360o rotation, safety clutch held. Permits control to a few seconds of arc. Absolutely free of
backlash, lag, or play. Ratio 31 to 1
DIMENSIONS: Height, upright, 14". With barrel horizontal, 11" high and long. Weight, 6.7 pounds
Company
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