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Questar’s commitment to quality, on which it has built its
worldwide reputation, is immediately apparent in the superb resolution
and mechanical precision of the Questar Titanium Light Weight
Classic Seven. Those who want more aperture than the Questar 3.5
provides will marvel at the lighter packaging, increased power and
quadrupled light grasp available with its larger offspring. The Light
Weight Titanium Classic 7” is an astronomical telescope that is
completely portable. You can use it on a tripod, table with its optional
equatorial mount and legs, or with Questar’s Large Astro Pier.
Our Classic 7” has been redesigned with changes to all internals to incorporate many new technologies that
we’ve borrowed from our exiting aerospace and surveillance satellite experience. All of our internal stainless
components are now titanium. To refine internal components to rapidly chill our optics and dissipate heat, we have
done extensive heat transfer analysis. ( Fourier analysis for isotropic material analyzing conduction, convection and
radiation heat transfer, optimizing Emissivity, Prandtl number and Nusselt number)
The Questar Light Weight Classic Seven Barrel includes Blue and Black anodized precision machined
lightened Aluminum and Titanium components 2540mm EFL f/14 tube assembly and tripod mount, Star Chart barrel
skin, lens cap, 16mm (159-318x) and 24mm (106-212x) eyepieces, New Control box multi port selector, with built-in
internal 2x barlow lens for eyepiece port, star-diagonal mirror, built-in finder, axial photographic port and eyepiece
port allowing 2” type eyepieces. Basic camera coupling set, thread on dewcap with Moon Map and ABS sealed
carrying case with wheels and handle. Weight of barrel assembly 19 lbs., in ABS sealed carrying case 35 lbs.
Shipping weight 65 lbs
TYPE: Maksutov Cassegrain Catadioptric
CLEAR APERTURE: 7 inches, 178mm
FOCAL LENGTH: Basic visual, 100 inches, 2540mm, Camera close, 112 inches, 2800mm
PHOTOGRAPHIC
FIELD OF VIEW: 1°15'
FINDER LENS: 23mm Ø, 184mm FL, 7x and 14x with 24mm and 16 mm eyepiece
ERECTING SYSTEM: BK-7 AlSiO coated Mirror Diagonal internally mounted in control box
EYEPIECES: Will support both 1-1/4 and 2” type. Unit ships with 1-1/4 24mm Brandon,
50° Ap Field, 16mm 4 lens Brandon, 50° Ap Field
AMPLIFYING OR
BARLOW LENS: - 66.06mm FL. (2X) internally mounted in control box
CORRECTOR LENS: Bk-7 MgF2 AR coated both sides, passes UV to 3300A°, IR to 1.5 microns
MIRROR: F2, Pyrex®, Quartz or low expansion Zerodur®
(for greatest thermal
stability) AlSiO coated, 7.600" dia.
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%
BARREL: Special extruded and stress-relieved 2024-T4 aluminum, machined full
length O.D. and I.D. and anti reflective painted on I.D.
LENS CELL: Precision machined and matched to barrel, Aluminum 2024-T4, blue
anodized
REAR CLOSURE PLATE: Precision machined and matched to barrel with special CNC milled internal
surfaces to increase heat transfer and lighten weight, Aluminum 2024-T4,
Blue anodized
MAIN TUBE MOUNTING
PLATE: Precision machined Titanium
FOCUSING MECHANISM: Mirror Thimble, precision machined Titanium, rides on
bearing, linear ball type, over a fixed, hardened and ground Titanium
light baffle tube. Conical stainless steel spring-loaded. Focus rod stainless
steel ground shaft with precision ground ¼-32 threads.
TRIPOD MOUNT Precision machined, matched and fixed mounted to barrel, with special
CNC milled internal surfaces to lighten weight. Aluminum 6064 and
Anodized. Has ¼-20 and 3/8-16 threaded hole for mounting to tripods.
CONTROL BOX: Precision machined and matched to barrel with special CNC milled inter-
nal surfaces increase heat transfer and lighten weight, Cast Aluminum 505,
special aluminum paint and clear over coated with internal anti reflective
black paint.
KNOBS: Aluminum 2024-T4, turned on turret lathe. Stainless steel shafts and
levers.
DIMENSIONS: Maximum length with control box 22.6”
Optical Center Line 5.6”
Maximum diameter 8.03”
Barrel Assembly weight 19 lbs.
Case Weight 32 lbs.
