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Today, Tele Vue's apochromatic refractor telescopes, which have reduced chromatic aberration, come in diameters ranging from 60mm (2.4 inches) to 127mm (5 inches). [1] The imaging system ("is" series) telescopes are designed primarily for astrophotography.
Apochromatic lenses for astrophotography in the 60–150 mm aperture range have been developed and marketed by several firms, with focal ratios ranging from f /5 to f / 7. Focused and guided properly during the exposure, these apochromatic objectives are capable of producing the sharpest wide-field astrophotographs optically possible for the ...
A refracting telescope (also called a refractor) is a type of optical telescope that uses a lens as its objective to form an image (also referred to a dioptric telescope). The refracting telescope design was originally used in spyglasses and astronomical telescopes but is also used for long-focus camera lenses .
This is a modern amateur Newtonian astrograph, specifically designed for astrophotography. An astrograph (or astrographic camera) is a telescope designed for the sole purpose of astrophotography. Astrographs are mostly used in wide-field astronomical surveys of the sky and for detection of objects such as asteroids, meteors, and comets.
Optical telescopes can be classified by three primary optical designs (refractor, reflector, or catadioptric), by sub-designs of these types, by how they are constructed, or by the task they perform. They all have their different advantages and disadvantages and they are used in different areas of professional and amateur astronomy .
Field flattener a correcting lens used to reduce field curvature in refracting telescopes for astrophotography. Barlow lens: Optical element to increase the telescope's focal length and magnification, narrow the field of view and reduce coma distortion, providing opposite effects of a telecompressor.
Astro-Physics, Inc. is a manufacturer of amateur telescopes, mounts, and accessories.Founded in 1975 by former Sundstrand Corporation engineer Roland Christen, [1] the company is noted for its line of apochromatic refractors as well as high-end mounts.
Some other telescope manufacturers use Takahashi refractors as collimating instruments for larger telescopes. Takahashi telescopes of various designs and sizes are installed in major observatories, such as Embry-Riddle Observatory , Hoober Observatory , Mirasteilas Observatory , Vega–Bray Observatory and others.