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christophers, ltd.
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800-422-7876
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Airy Disk
Altazimuth Mount
Aperture
Armored
Aperture Mask
Apochromat
Astigmatism
Astronomical Binoculars
Averted Vision
Blooming
Cassegrain
Catadioptric Telescope
CCD Point, Cluster, and Column Defects
Close Focus
Collimation
Color correction
Coma
Crayford Focuser
Curvature of Field
Dawes' Limit
Declination
Diffraction
Diffraction-Limited
Distortion
Dobsonian Telescope
Equatorial Mount
Exit Pupil
Eye Relief
Eyepiece
Field curvature
Focal Length
Focal Ratio
Fork Mount
German Equatorial Mount
Ghosting
Highest Useful Magnification
Interpupillary Distance
Limiting Magnitude
Magnification
Magnitude
Maksutov-Cassegrain
Newtonian Reflector
Number of optical elements
Objective
Optical Type
Phase Coatings
Photographic Focal Length
Photographic Focal Ratio
Rayleigh Criterion
Recollimation
Refractor
Relative Brightness
Resolution
Rich Field Telescope (RFT)
Right Ascension
Ritchey-Chrétien
Schmidt-Cassegrain Telescope (SCT)
Seeing
Setting Circles
Spherical Aberration
Spotting Scope
Star-Hopping
Transparency
Twilight Factor
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PRIVACY POLICY 7/1/2004
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Fine Print
Toll-Free Telephone Astronomics: 800-422-7876; Christophers, Ltd.: 800-356-6603
Alternate Telephone: 405-364-0858 24 Hour Fax Line: 405-447-3337
Telephone Hours: Monday-Friday 8 AM - 9 PM CST
Saturday Noon - 5 PM CST
Store Hours: Monday-Friday 9 AM - 5 PM CST
Saturday Noon - 5 PM CST
Astronomics / Christophers, Ltd.
680 S.W. 24th Ave.
Norman, OK, 73069
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