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Opticstar XL 7.2mm-21.5mm ZOOM Eyepiece
Very High Quality Zoom Eyepiece - Flat Field of View
Opticstar XL 7.2mm-21.5mm ZOOM Eyepiece.
  • Focal length: 7.2mm-21.5mm ZOOM
  • Apparent field of view of 40° to 60°
  • 1.25" threaded barrel for filters
  • Optical elements: 7 lenses, 4 groups
  • Particularly flat field of view
  • Parfocal at all magnifications
  • Eye relief: 15mm
  • Adjustable twist-type eye cup
  • High contrast optics:
    • Blackened lens edges
    • Internal baffling
  • Excellent mechanical construction
  • Weight: 155 grams
Opticstar Visual
CCD Cameras
Opticstar Imaging
Opticstar XL 7.2mm-21.5mm ZOOM Eyepiece
Model / Description View in Showroom Order code Price inc VAT Shipping Dispatched witnin click button to purchase
OS XL 7.2mm-21.5mm ZOOM no OSRXLZ72 £ 130.00 £ 6.00 24 hours

This very high quality zoom eyepiece delivers a particularly flat field of view, high contrast and excellent colour rendition. It is recommended for astronomical and terrestrial use as well as for Solar observing with an appropriate telescope.

The eyepiece provides an apparent field of view of 60°-40° and continuous focal lengths between 7.2mm and 21.5mm, this range particularly suits SCT type telescopes that will operate at their highest magnifications at around 7.5mm under reasonable conditions. When used in conjunction with a 2x barlow the eyepiece will reach the maximum possible magnification for a f4.8 Newtonian telescope thus making it very versatile with a variety of telescopes of different optical designs, focal lengths and focal ratios.

The excellent mechanical construction and finish when combined with a sizeable 15mm eye relief an adjustable twist-type eye cup make these eyepieces comfortable to use. In addition the eyepiece is parfocal and as such there is no need to refocus when changing magnifications.

The optical train consists of seven lenses in four separate groups, all optical surfaces are broadband fully multi-coated and all lenses feature blackened edges, the eyepiece also benefits from internal baffling. These features reduce internal reflections to an absolute minimum and help to significantly increase contrast.

The Eyepiece has a 1.25" nosepiece and is threaded for filters. It weighs 155 grams, measures 81mm tall (including the nosepiece) and has a 48mm maximum diameter.

For an even higher specification zoom eyepiece please consider the Opticstar XL 7.5mm-22.5mm ZOOM.

Opticstar XL Zoom Eyepieces.
Opticstar XL Zoom Eyepieces shown with the Opticstar ED80S (f6.25) Gold - Dual Speed refractor.

We are constantly checking the accuracy of the technical data. We are prepared to provide more detailed information on request. Technical data is subject to change without notice.

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The new Opticstar DS-616C XL+ deep-sky CCD is the successor to the popular DS-616C XL that earned the annual star product award back in 2013. It maintains all the features of the original model as well as other improvements.

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The Opticstar DS-616C XL deep-sky CCD camera has earned the annual star product award from Astronomy, the world's best-selling astronomy magazine. Read about it in the September 2013 issue.

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