Schmidt-Cassegrain Optical

More Information  · Supplied Accessories  · Recommended Accessories Price $4,749.00 List Price $8,469.95 Highest Useful Magnification 652x Visual Limiting Magnitude 15.3 Focal Length 3910mm Focal Ratio f/11 Resolution 0.33 arc seconds Aperture 14" Weight 45 lbs. Heaviest Single Component 45 lbs. Warranty 2 years

Advanced high transmission Starbright XLT optical multicoatings are standard equipment. This coatings package includes high reflectivity multilayer aluminum mirrors enhanced with titanium dioxide for high reflectivity, plus a unique combination of magnesium fluoride and hafnium dioxide antireflection coatings on both sides of the Schmidt corrector lens. The corrector lens itself is made of high transmission water white float glass instead of conventional soda lime glass (which has 3.5% lower transmission) used in other telescopes.

Starbright XLT multicoatings visibly increase the contrast on subtle lunar, planetary, and nebula details when compared with a scope with standard multicoatings. They also give you higher light transmission for brighter deep space images and shorter exposure times during CCD and 35mm photography. Across the total visual/photographic spectrum from 400nm to 750nm, independent laboratory tests show the new Starbright XLT coatings are 16% brighter overall than even the original industry-standard Starbright multicoatings.

The optics are hand-figured. Hand figuring the optical system is a complex optical procedure done on a commercial basis only by Celestron. Four separate optical tests are made on every set of optics, using a double-pass laser autocollimator – an Airy disc inspection, a test for spherical aberration by examining the diffraction images on both sides of focus, a Ronchi grating test, and a knife edge test. A skilled optician evaluates these tests. He then fabricates a precision pitch lap and delicately hand polishes the secondary mirror to compensate for any small residual zonal defects and smooth the optical figure. Done a few strokes at a time, and testing constantly to evaluate their effect, this final hand-figuring can take hours. But, when it is finished, the optical performance makes every tedious hour of hand-crafting well worth the effort.

The optical tube comes with a big 9 x 50mm straight-through achromatic finderscope and mounting bracket. The finder has a wide 5° field of view. It focuses by loosening the trim ring behind the objective lens cell, screwing the lens cell in or out to focus, and tightening the trim ring to lock in the correct focus. Also standard is a 2" mirror-type star diagonal, as is a 2" 40mm E-Lux Kellner eyepiece. This eyepiece provides a magnification of 98x. Its field of view is 0.51° across, as wide as the full Moon. Dust covers for the optics are also supplied.

The optical tube is equipped with a slide bar with a standard 75mm (3") wide dovetail for mounting the tube on a Celestron CGE Computerized German equatorial mount or a Losmandy G-11 or HGM Titan mount. Optional split mounting rings are also available to put the tube on any another mount of the buyer’s choosing.