- Lowest cost per inch of aperture compared to refractors and catadioptrics since mirrors can be produced at less cost than lenses in medium to large apertures.
- Reasonably compact and portable up to focal lengths of 1000mm.
- Excellent for faint deep sky objects such as remote galaxies, nebulae and star clusters due to the generally fast focal ratios (f/4 to f/8).
- Reasonably good for lunar and planetary work.
- Good for deep sky astrophotography (but not as convenient as and more difficult to use than catadioptrics).
- Low in optical aberrations and deliver very bright images.
- Generally not suited for terrestrial applications.
- Secondary (diagonal) mirror and its supporting structure obstruct some of the incoming light, leading to slight light loss and scattering (diffraction of light) when compared with refractors.