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OPTICAL QUALITY OF TELESCOPES

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OPTICAL QUALITY OF TELESCOPES

The optical quality of a lens or mirror is determined by its deviation from a theoretically perfect curve, whether spherical (as in refractors or many catadioptric telescopes) or paraboloidal (as in the Newtonian reflector). This deviation includes errors in figure (the theoretically perfect curve), and the small bumps and pits left over from the grinding and polishing process of manufacture. The better mirrors and lenses have a more accurate figure and a smoother polish, with inconsequential errors in figure, surface bumps or pits. Inaccuracies in the figure of a mirror or lens are usually described by small fractions of a wavelength of green light. When the deviations from a perfectly figured surface have become small enough that the final image is not affected by them, we refer to those optics as “Diffraction Limited”. You may also see figures like 1/4 wave, or 1/8 wave used to describe the accuracy of the optical figure. These refer to the size of the deviations from a perfect surface, and represent incredibly small inaccuracies. As for surface bumps and pits (surface roughness), though completely home-made optics may suffer from the effects of poor surface quality, this is now rare in commercially-produced telescopes.

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SCHMIDT-CASSEGRAIN TELESCOPES

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Meade LT 8 inch SC (f/10) Schmidt-Cassegrain Telescope w/UHTC
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Eligible for Rewards
Meade LT 8" SC (f/10) Schmidt-Cassegrain Telescope w/UHTC
Item No. 112-20810
Manuf. No. Meade 0810-04-12

Meade 0810-04-12 LT-8 is the ideal telescope for any astronomer who demands superior optics, mechanics and computer control in a compact high-performance package.
 
Our Price: $1,399.00
Buy Meade LT 8 inch SC (f/10) Schmidt-Cassegrain Telescope w/UHTC
 

Meade Telescopes LS 8 inch Schmidt-Cassegrain with UHTC
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Meade Telescopes LS 8 inch Schmidt-Cassegrain with UHTC
Item No. 112-20710
Manuf. No. Meade 0810-03-12

Meade 0810-03-12 Telescopes Built-in GPS, magnetic north sensors, level sensors and a CCD camera do all the work - within minutes you're observing
 
Our Price: $1,799.00
Buy Meade Telescopes LS 8 inch Schmidt-Cassegrain with UHTC
 

Meade LT-6SC 6 inch go-to altazimuth Schmidt-Cassegrain Telescope, with UHTC multicoated optics
New
Meade LT-6SC 6 inch go-to altazimuth Schmidt-Cassegrain Telescope, with UHTC multicoated optics
Item No. 112-20610
Manuf. No. Meade 0610-04-12

Meade 0610-04-12 Telescope. The simple tripod/altazimuth mount configuration of the LT-6SC makes setup fast and easy. The rapid alignment features of the AudioStar computer
 
Our Price: $999.00
Buy Meade LT-6SC 6 inch go-to altazimuth Schmidt-Cassegrain Telescope, with UHTC multicoated optics
 

Celestron C-14 A Schmidt-Cassegrain Optical Tube w/ StarBright XLT coatings, and FASTAR compatible
New
Celestron C-14 A Schmidt-Cassegrain Optical Tube w/ StarBright XLT coatings, and FASTAR compatible
Item No. 602-11016
Manuf. No. Celestron 91038-XLT

Celestron C-14 A is 14.0"/356mm Aluminum Schmidt-Cassegrain Telescope Optical Tube Assembly (3910mm f/11.0).
MSRP: $8,798.00
Our Price: $5,199.00
Buy Celestron C-14 A Schmidt-Cassegrain Optical Tube w/ StarBright XLT coatings, and FASTAR compatible
You Save $3,599.00

Celestron EDGE HD 800 Schmidt-Cassegrain Telescope OTA
New
Celestron EDGE HD 800 Schmidt-Cassegrain Telescope OTA
Item No. 602-91070
Manuf. No. Celestron 91030-XLT

EDGE HD 800 OTA - The EdgeHD is Celestron's latest innovation that will surely be the system of choice for the serious astro-imagers. Available January 2010
MSRP: $2,198.00
Our Price: $1,299.00
Buy Celestron EDGE HD 800 Schmidt-Cassegrain Telescope OTA
You Save $899.00

Celestron EDGE HD 1400 Schmidt-Cassegrain Telescope OTA
Celestron EDGE HD 1400 Schmidt-Cassegrain Telescope OTA
Item No. 602-91073
Manuf. No. Celestron 91060-XLT

EDGE HD 1400 OTA - The EdgeHD is Celestron's latest innovation that will surely be the system of choice for the serious astro-imagers. Available January 2010
MSRP: $10,398.00
Our Price: $5,799.00
Buy Celestron EDGE HD 1400 Schmidt-Cassegrain Telescope OTA
You Save $4,599.00

Celestron EDGE HD 1100 Schmidt-Cassegrain Telescope OTA
Celestron EDGE HD 1100 Schmidt-Cassegrain Telescope OTA
Item No. 602-91072
Manuf. No. Celestron 91050-XLT

EDGE HD 1100 OTA - The EdgeHD is Celestron's latest innovation that will surely be the system of choice for the serious astro-imagers. Available January 2010
MSRP: $5,980.00
Our Price: $3,399.00
Buy Celestron EDGE HD 1100 Schmidt-Cassegrain Telescope OTA
You Save $2,581.00

Celestron EDGE HD 925 Schmidt-Cassegrain Telescope OTA
Celestron EDGE HD 925 Schmidt-Cassegrain Telescope OTA
Item No. 602-91071
Manuf. No. Celestron 91040-XLT

EDGE HD 925 OTA - The EdgeHD is Celestron's latest innovation that will surely be the system of choice for the serious astro-imagers. Available January 2010
MSRP: $4,198.00
Our Price: $2,299.00
Buy Celestron EDGE HD 925 Schmidt-Cassegrain Telescope OTA
You Save $1,899.00

Celestron CGEM 1100 Schmidt-Cassegrain Computerized GoTo Telescope
Celestron CGEM 1100 Schmidt-Cassegrain Computerized GoTo Telescope
Item No. 102-11520
Manuf. No. Celestron 11082

CGEM 1100 - The EdgeHD is Celestron's latest innovation that will surely be the system of choice for the serious astro-imagers. Available January 2010
MSRP: $7,240.00
Our Price: $3,999.00
Buy Celestron CGEM 1100 Schmidt-Cassegrain Computerized GoTo Telescope
You Save $3,241.00

Celestron CGEM 800 Schmidt-Cassegrain Computerized GoTo Telescope
Celestron CGEM 800 Schmidt-Cassegrain Computerized GoTo Telescope
Item No. 102-11500
Manuf. No. Celestron 11080

CGEM 800 - The EdgeHD is Celestron's latest innovation that will surely be the system of choice for the serious astro-imagers. Available January 2010
MSRP: $4,558.00
Our Price: $2,499.00
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You Save $2,059.00

Celestron CGE Pro 1400 Schmidt-Cassegrain Computerized GoTo Telescope
Celestron CGE Pro 1400 Schmidt-Cassegrain Computerized GoTo Telescope
Item No. 102-11620
Manuf. No. Celestron 11094

CGE PRO 1400 - Celestron's newest line of observatory class Schmidt-Cassegrain telescope, comes mounted on the state of the art CGE GoTo German Equatorial mount.
MSRP: $17,998.00
Our Price: $9,999.00
Buy Celestron CGE Pro 1400 Schmidt-Cassegrain Computerized GoTo Telescope
You Save $7,999.00

Celestron CGE Pro 1100 Schmidt-Cassegrain Computerized GoTo Telescope
Celestron CGE Pro 1100 Schmidt-Cassegrain Computerized GoTo Telescope
Item No. 102-11610
Manuf. No. Celestron 11093

CGE PRO 1100 - Celestron's newest line of observatory class Schmidt-Cassegrain telescope, comes mounted on the state of the art CGE GoTo German Equatorial mount.
MSRP: $13,998.00
Our Price: $7,999.00
Buy Celestron CGE Pro 1100 Schmidt-Cassegrain Computerized GoTo Telescope
You Save $5,999.00

Celestron CGE Pro 925 Schmidt-Cassegrain Computerized GoTo Telescope
Celestron CGE Pro 925 Schmidt-Cassegrain Computerized GoTo Telescope
Item No. 102-11600
Manuf. No. Celestron 11092

CGE PRO 925 - Celestron's newest line of observatory class Schmidt-Cassegrain telescope, comes mounted on the state of the art CGE GoTo German Equatorial mount. Available January 2010
MSRP: $12,598.00
Our Price: $6,899.00
Buy Celestron CGE Pro 925 Schmidt-Cassegrain Computerized GoTo Telescope
You Save $5,699.00

Meade LX90-SC 12 inch Go-to altazimuth Schmidt-Cassegrain, with UHTC multicoatings and GPS
Eligible for Rewards
Meade LX90-SC 12 inch Go-to altazimuth Schmidt-Cassegrain, with UHTC multicoatings and GPS
Item No. 112-34020
Manuf. No. Meade 1210-90-05

Meade 1210-90-05, 12" LX90-SC is a very large aperture telescope. It is a great choice for both the serious amateur astronomer and the school or college observatory.
 
Our Price: $2,899.00
Buy Meade LX90-SC 12 inch Go-to altazimuth Schmidt-Cassegrain, with UHTC multicoatings and GPS
 

Meade LX90-SC 10 inch Go-to altazimuth Schmidt-Cassegrain Telescope, with UHTC multicoatings and GPS
Eligible for Rewards
Meade LX90-SC 10 inch Go-to altazimuth Schmidt-Cassegrain Telescope, with UHTC multicoatings and GPS
Item No. 112-34010
Manuf. No. Meade 1010-90-05

Meade LX90-SC 10 inch Go-to altazimuth Schmidt-Cassegrain Telescope. It includes a GPS receiver and an AudioStar computer that takes the guesswork out of finding your way around the skies.
 
Our Price: $2,399.00
Buy Meade LX90-SC 10 inch Go-to altazimuth Schmidt-Cassegrain Telescope, with UHTC multicoatings and GPS
 

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