Optical Tube Assemblies

Optical Tube Assemblies

refracting or refractor telescope is a type of optical telescope

that uses a lens as its objective to form an image

(also referred to a dioptric telescope)

Learn More About Refractors

Optical Tube Assemblies Grovers Optics Northallerton

Optical Tube Assemblies

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  • Sky-Watcher EvoStar-150, 150mm (6") f/1200 Achromatic Refractor Optical Tube Assembly. The Sky Watcher Evostar series are two-element air-spaced, multi-coated object achromatic refractors

  • Sky-Watcher Evostar 120

    Price £349.00

    An excellent white light solar refractor by adding some Baader Astrosolar over the front aperture. 120mm is easily enough for visibility of all Messier objects as well as good lunar and planetary detail.

  • The same quality and performance level as our now legendary Equinox series, making them superb instruments for both imaging and visual observations

  • The new EVOSTAR DS-PRO Series ED Apochromatic refractors with the same quality and performance level as our now legendary Equinox series

  • The Sky-Watcher Esprit-80ED Professional Super APO Triplet Refractor OTA are instruments of the highest quality with optical performance

  • Sky-Watcher StarTravel 150 EQ5
    • On sale!

    Sky-Watcher STARTRAVEL telescopes are two-element, air-spaced achromatic refractors, that are well proven performers for ‘Rich-Field’ views of comets, star fields, star clusters, nebulae, bright galaxies & planets, the Moon and the Sun (with proper safety filtering!), as well as giving excellent daytime terrestrial views when used with an erecting prism (not supplied with this model).

  • Sky-Watcher EvoStar-150ED, 150mm (6") f/1200 Apochromatic Refractors, due to their unobstructed, text-book like diffraction patterns, produce the sharpest, highest quality optical imaging available, bar-none, aperture for aperture, of any telescope optical system.

  • This high-end Evostar-72ED Apo features a doublet objective lens, with one Extra-Low Dispersion (ED) glass element. Top quality Schott glass is utilised for the Crown element

  • We are proud to introduce the new Sky-Watcher Professional ESPRIT 3-Element ED apochromatic refractors. These are instruments of the highest quality with optical performance rivalling or exceeding similar telescopes of even the most famous high-end telescope brands

  • We are proud to introduce the new Sky-Watcher Professional ESPRIT 3-Element ED apochromatic refractors. These are instruments of the highest quality with optical performance rivalling or exceeding similar telescopes of even the most famous high-end telescope brands.

  • Sky-Watcher Esprit 100ED...

    Price £1,899.00

    The Sky-Watcher Esprit-100ED Professional Super APO Triplet Refractor OTA are instruments of the highest quality with optical performance

  • As Startravel-80 EQ1 but comes instead with 45º Erect Image Diagonal, and supplied without Equatorial Mount and Tripod. Complete with tube rings