They also tend to have fast focal ratios when made for astrophotography and work well with focal reducers.

The weight of a camera is on the back of their tube instead of the side. Simplified astro-imaging – Refractors don’t have the razor-sharp collimation requirements of a Newtonian reflector, nor do they have mirror flop or image shift.Refractors seldom have issues with their lens coatings degrading over time, and will never become nearly useless the way a reflector can with a degraded primary mirror. Big refractors may need some time for their lenses to acclimate to cooler temperatures, but small refractors need little and do not suffer from warm air rising through the tube and causing “tube currents” like a reflector or catadioptric. Convenience – Refractors require negligible amounts of care when it comes to preserving the optics, collimating them, and of course cooling down.A refractor typically punches above its weight class in terms of image brightness, contrast, and resolution by about an inch or two of aperture compared to catadioptric and reflecting telescopes which use two or more mirrors to create an image. Higher performance – With no mirror coatings to scatter light, no secondary mirror to smear out diffraction rings, and the ability to add baffling to control stray light, refractors are more efficient with their aperture – which is usually small.

Refractors have a number of advantages over reflectors and catadioptrics, such as:

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Celestron Advanced VX 6' Refractor on Advanced VX Computerized Equatorial Mount.

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Optical telescope