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THE STANDARD QUESTAR

All models available with Pyrex® or Zerodurs mirrors

Questar Powerguide and Questar Starguide (Price List, page 6) The Questar Powerguide, which operates on house current or from any 12-volt DC power source, enables the Questar user to select sidereal or lunar driving rates by merely pushing a switch. A 12-foot cord plugs into automatic cigarette lighter receptacle, for use in the field, or into standard 110 volt AC socket.

A hand-held control cylinder permits the operator to stop the Questar drive or to speed it beyond sidereal rate, a practical necesssity for deep-sky photography. An important convenience is the controllable power source to illuminate the separately available cross-hair Reticle Eyepiece.

The Questar Starguide is an auxiliary guiding system specifically for deep-sky photography. It comprises an Off-axis Tracker and Declination Vernier Drive. The Tracker consists of a prism which intercepts a small portion of the ray bundle and directs it to a guiding eyepiece. Its built-in shutter can be closed instantly when corrections are needed and opened when back on target. For easier acquisition of a guide star and comfort in guiding, the eyepiece can be swiveled 360° and is completely independent of the camera position. The Vernier Drive is a compact gear box which is easily adaptable to the Questar Declination Drive, permitting corrections on a 10 to 1 ratio over the already extremely accurate drive. Its flexible cable permits operation from any position.

Questar's commitment to quality which has built its world-wide reputation, is immediately apparent in the superb resolution of the Questar Seven and its mechanical perfection. Those who want more aperture than the 31/2-inch Questar provides, marvel at the performance of the Seven which easily doubles that of its smaller parent.

The Seven, like the Standard 31/2, is a fully-mounted astronomical telescope that is completely portable. You can use it on a table with its own polar equatorial support, or with Questar's Folding Pier.

The Questar Seven, adhering to the same high standards, delivers twice the resolution with four times the light grasp, while retaining the convenience and versatility of the Questar 31/2.

The Folding Pier is the most luxurious support ever devised for a telescope of large aperture, and is usable from either seated or standing position. Its weight is only 37 pounds complete with the supporting cradle that holds the telescope, regardless of your latitude, so that the center of gravity is always over the center of the tripod.


The Astro 7"

The Astro 7" is based on the acclaimed Questar 7" Maksutov design. The combination of unsurpassed optics with a simple rugged design contribute to making it the idea medium to high magnification lens by changing eyepieces or adding optional auxiliary lenses to change EFL. The system is set up to use 2" slip type eyepieces via the 2" mirror diagonal. The diagonal can be adapted via eyepiece adapter to accept 1 ¼" or the Questar Brandon. Other included accessories are the thread on dew cap, extension tubes, star beam finder and removable mounting bracket. All packaged in foam lined travel case. The Astro is light, compact, and well-balanced; its configuration makes it perfect for use with eyepieces, video and night vision, and photographic equipment.

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The Questar Duplex 3.5" Telescope

The Questar Duplex is the most versatile Questar instrument because its design permits it to be separated into two parts. The barrel, which is actually the Field Model with moon map and star chart added, can be carried separately in its own case for field trips. When the two parts are assembled, the Duplex has every feature of the fully mounted Questar Standard astronomical telescope. To separate the barrel from the mounting, hold it in one hand, and release the knurled screw under the collar which supports it. The screw attaches to the ¼-20 hole in the bottom support of the barrel which is used also to connect it to a tripod.

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The Questar Standard 3.5" Telescope

The Questar Standard 3.5 has long been regarded as the finest personal telescope in the world. In addition to the telescope's legendary resolution, flatness of field and contrast, the Standard has integrated features that are unavailable with other telescopes.
The control box has two (2) viewing ports with flick knob selection. It provides three power changes per eyepiece, an internal finder and two telescopic powers. Included also are 2 eyepieces, a star-diagonal prism, solar filter for finder lens, off-axis glass solar filter, and focusable eyepiece diopter. The barrel rotates for viewing height adjustment and is silk-screened with a functional Moon Map. The removable dewcap is a Star Chart.

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Questar Wide-sky Telescopes

The remarkable performance of Questar's new wide-sky telescopes-in comet seeking, variable star observing, general sky scanning and for the observing of all deep-sky phenomena-dispels the popular misconception that short focal lengths (f/3 to f/5) are essential for effective deep-sky observing and optimum image brightness. Image brightness is a function of aperture and magnification, and has nothing to do with focal length. We continue to use long focal ratios, which rule out the chromatic aberrations of short-focal-length refractors, as well as the below-par
imagery of short-focal-length eyepieces. (See prices on page 5)

The Questar 12 and the Questar Mount

The Questar 12 is the largest member of the Questar family of fine optical instruments-a natural development stemming from our long experience with the Maksutov system. Here is a large telescope with the resolution that theory prescribes, in a manageable size that can simplify the problems of portability and housing. The impact of the Questar 12 on those who look through it for the first time is overwhelming; its resolution is the incontrovertible proof of optical quality; it is Questar's answer to the problem of an important telescope for the university, an optical system for special industrial applications, as well as the ultimate in a personal telescope.

The Questar Mount is designed with over-sized components so that it can accommodate any Questar up to 18 inches. A German equatorial type, it is notable for its 360°
continuous tracking in R.A. with precision tracking to better than 4 arc seconds.

Questar Long-range Microscopes

We build two versions of our photo-visual close-focusing Questars: one is the QM 1, a wholly new instrument designed specifically for optimum performance at distances between 22 and 66 inches. It fills a long-standing need for many research and industrial uses-in non-destructive testing, non-disruptive observation and non-contact gauging and inspection. For example, it is used to observe biological specimens in a controlled environment, to do crack propagation studies, to inspect the integrity of a microcircuit, to examine radio-active samples. At 22 inches it will resolve below 2.5 microns.

The second version is the DR 1, a dual-range instrument with two barrels; one for close focusing from 36 to 96 inches, and one with the regular Questar capability of 10 feet to infinity. With the two you have a range from 3 feet to infinity.

Both QM 1 and DR 1 come with case, eyepiece, built-in finder and power changes, 1.6x visual Barlow, erecting prism, lens cap and basic camera coupling set.

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