Schmidt -Cassegrain Advantages   

• Best all-around, all-purpose telescope design. Combines the optical advantages of both lenses and mirrors while cancelling their disadvantages.
• Excellent optics with razor sharp images over a wide field.
• Excellent for deep sky observing or astrophotography with fast films or CCD?s.
• Very good for lunar, planetary and binary star observing or photography.
• Excellent for terrestrial viewing or photography.
• Focal ratio generally around f/10. Useful for all types of photography. Avoid faster f/ratio telescopes (they yield lower contrast and increase aberrations). For faster astrophotography, use a Reducer/Corrector lens.
• Closed tube design reduces image degrading air currents.
• Most are extremely compact and portable.
• Easy to use.
• Durable and virtually maintenance free.
• Large apertures at reasonable prices and less expensive than equivalent aperture refractors.
• Most versatile type of telescope.
• More accessories available than with other types of telescopes.
• Best near focus capability of any type telescope.

Schmidt-Cassegrain Disadvantages

• More expensive than Newtonians of equal aperture.
• It is not what people expect a telescope to look like.
• Slight light loss due to secondary mirror obstruction compared to refractors.