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These objectives are APOCHROMATIC, which means that the images are essentially free of false color, both visually and photographically. Roland Christen selected Super ED to be the heart of his new optical designs because of its excellent light transmission and superior correction of all the monochromatic and polychromatic aberrations. Super ED is a more advanced glass than the more common varieties used in commercial refractors. It has allowed Astro-Physics to use crown rather than flint for the outer elements. Normal ED (FK01) and even Fluorite doublets use flint glasses as the leading element, causing the color correction to be less than perfect, especially in the violet region of the spectrum. These flints introduce false color that can be seen as purple halos around bright objects, or purple fringing along the Lunar edge and at the edges of bright craters. This color error can cause brighter stars to bloat on long exposure photographs.

The Starfire EDT design (which includes the 105 Traveler EDT telescope) consists of three matched optical glasses to combine the colors of the visual spectrum into intense, sharp, concentrated images. The views are extraordinary. As you can see on the specification sheets, the superb color correction of these EDTs surpasses the fluorite doublets, particularly in the far violet part of the spectrum where Technical Pan films have their highest sensitivity.

The highly acclaimed Starfire EDF design has been available over recent years in 105mm, 130mm, 155mm, 180, and world record 206mm diameter. These were developed with very fast focal ratios for amateurs who long to achieve superb, wide field astrophotographs. For avid astrophotographers, we offer the 155mm Starfire EDF, the new 160mm Starfire EDF and larger EDF refractors with giant 4" focusers to allow coverage of medium format films with minimal vignetting. In the hands of knowledgeable astrophotographers, these instruments can produce superb, professional astrophotographs of all your favorite deep-sky objects. Images are so sharp, it requires enlargements of up to 30" x 40" to resolve the finest details. We also offer the 155mm Starfire EDF with the 2.7" focuser for individuals who desire the ultimate portable, versatile refractor, but do not require the larger focuser.

Their relatively compact arrangement makes the EDF series of telescopes truly one man manageable instruments; affording spectacular views unmatched by any other telescope systems in terms of field of view, detail, color fidelity, contrast and clarity. One of the important advantages of a short focal length is that the mounting can be relatively smaller, lighter and more compact than longer telescopes. The result is a highly portable refractor system with superior imaging qualities, ideal for a wide variety of astronomical work from high-magnification lunar/planetary to deep sky astrophotography.


Astro-Physics equatorial mounts are designed for solid stability under a variety of observing conditions. At the same time, the mounts are truly portable so that amateurs can transport them to their favorite dark-sky site and set them up quickly and accurately. The mountings break down into manageable sizes, but when set up, they are extremely rugged and steady platforms. Astro-Physics has also developed a very accurate worm gear set and state of the art electronics technology to insure smooth, effortless tracking of celestial objects for all visual and photographic purposes, and a high degree of durability and reliability.

To achieve these performance criteria, Astro-Physics combined the latest technology with time-tested design concepts. The basic mounting configuration was engineered with proper vibration and strength of materials criteria. As in a good building design, all loads are channeled into massive load-bearing cross sections to their final destination - the ground. This is engineered in a manner that minimizes mass and size while maximizing rigidity. For examples of this, study the tension rods on the piers, and the thrust bearings on the polar and declination axes that transfer a tremendous amount of load in relation to their size. To these mechanics is added a drive that is accurate and sophisticated enough for the most demanding application, featuring a custom-manufactured fine-pitch worm gears driven by a high-resolution stepper motor with an advanced hand held controller. This makes the tracking of celestial objects a snap, even for beginners.


Astro-Physics telescopes are complemented by the most comprehensive, custom matched series of accessories and options that make these telescopes particularly versatile. From CCD imaging to 35mm and medium format film camera adapters to photo-visual telecompressors, these have carefully designed for functionality and compatibility. They are all tested and proven in the field under actual observing conditions, and available at most reasonable prices.


Astro-Physics refracror telescopes are designed and manufactured in their modern optical facility in Illinois, so these telescope lenses are truly 100% AMERICAN-MADE. Using only precision "A" grade optical glass, which has high light transmission characteristics and is free of striae and imperfection. Each time they begin a new production run of lenses, Roland Christen computer-optimizes the design based on the particular melt characteristics of the new glass. Then, Astro-Physics opticians adjust the tooling accordingly to achieve the desired curves.

All lenses are polished on pitch and hand-corrected. Each lens is tested, polished and tested repeatedly throughout the production process. This continues until the desired performance is achieved. During the final figuring stage, the lens is evaluated with a laser interferometer. Mass-production techniques are not employed as it is impractical; each lens is treated individually. This process is very time-consuming, but there is virtually no other way to attain the level of resolution, definition, and contrast that the most demanding applications demand.

The combination of the apochromatic lens design, careful, precise optical production techniques, high-transmission multi-coatings and well-baffled tube assemblies results in a clean optical system with superior contrast and light grasp.


Most of the mechanical components are machined in-house on ultra-modern three-axis CNC (computerized numerical control) lathe and CNC machining center. Highly skilled machinists maintain very accurate tolerances thereby producing components that uphold the Astro-Physics reputation for rigid mountings, precision tracking, smooth operating focusers, and unrivaled accessories.


The Optical Tube Assembly Department at Astro-Physics carefully installs the baffles within the telescope tubes to insure that the placement is precise thereby effectively eliminating stray light. The interior of the tube is then finished with an anti-reflection black paint. Each lens cell and focuser are squared onto the tube in preparation for the final assembly and final collimation (alignment) of the telescope.


The Mount Assembly Department is staffed by professional telescope makers who are advanced users and observers. Their experience is brought to bear during the design, fabrication, and final assembly of each mounting. During assembly, the staff works diligently to assure the mount adjustments (many done by "feel") are nominal. And here is where the hand controller and motor components are carefully assembled, with components being soldered to the circuit boards, and all components tested prior to shipment.


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