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Opticstar 2" x2 XL TeleXtender
Premium TeleXtender for Research-Quality Images
Opticstar TeleXtender.
  • Aperture: 2"
  • Objective lens: 4 elements
  • Fully Multi Coated
  • High resolution optics
  • Blackened edges throughout (no internal reflections)
  • Consistent x2 magnification at all times
  • Compression ring
  • Includes adapter for 1.25" accessories
Opticstar Visual
CCD Cameras
Opticstar Imaging
Opticstar 2" x2 XL TeleXtender
Model / Description View in Showroom Order code Price inc VAT Shipping Dispatched witnin click button to purchase
OS 2" x2 TeleXtender no OSRTX22 £ 99.00 £ 6.00 24 hours

The Opticstar 2" x2 XL TeleXtender is a premium quality optical amplifier that excels in visual observation and particularly in astro-photography. It is ideal for high power views of the planets and the Moon. The four element optical design is fully multi-coated with EMD enhanced coatings, resulting in bright and sharp images. Every element has blackened edges to reduce internal reflections and increase contrast. An adapter for 1.25" accessories is included.

Opticstar TeleXtenders Overview
Opticstar TeleXtenders increase the effective focal length of the optics that it is used in conjunction with, thus producing higher magnifications in imaging and visual applications. They are similar to barlow lenses in concept, but they have the distinct advantage that they maintain a consistent magnification irrespective of their placement in the optical train. This quality enables the optics designer to optimise the optics for maximum performance.

When using a barlow to increase the magnification of your optical system, the results will be dependent on where the barlow is placed in the optical train. If for example, you place a x2 barlow lens in front of the mirror diagonal instead of behind it (barlow-diagonal-eyepiece as opposed to diagonal-barlow-eyepiece), the results will differ. You won't get 2 times magnification in both set-ups. The magnification varies with placement. However, with the Opticstar TeleXtenders, even if the distance is changed, the magnification always remains the same. You can place your TeleXtender anywhere along the optical train between an eyepiece or a camera, and if you are supposed to get 2 times magnification (with a x2 TeleXtender for example), you will actually get 2 times magnification.

This is particularly important in imaging because you may want to introduce an accessory like a flip mirror or filter wheel in between the TeleXtender and a CCD camera, which would increase the distance to the focused image. This difference in design allows for consistent results whether increasing the magnification of a lower power eyepiece for visual observation or using the Opticstar TeleXtenders in imaging applications. Visual observers also benefit because the magnification can be increased without sacrificing on eye relief.

Better Eye Relief
The TeleXtenders add flexibility to your accessory line-up. They allow the increase the magnification of any eyepiece with the same barrel size that you already own. In other words, 2 eyepieces offer 4 magnification choices with the addition of a TeleXtender. Typically, lower magnification eyepieces have better eye relief than higher power eyepieces. With a TeleXtender it is possible to increase the magnification and still maintain the generous eye relief of the lower power eyepieces. This is especially important for eyeglass wearers or for those with fast telescopes who can really use high magnification eyepieces to their limit.

Better Manufacturing Standards
The Opticstar TeleXtenders are optimized through each design, fabrication, and testing process. The superior quality large optical elements produce high contrast and high resolution images.

Optical Coatings
Fully multi-coated with EMD enhanced optical coatings result in durable coatings, bright and sharp images. All 4 optical elements have blackened edges to reduce internal reflections and increase contrast.

Tapered Barrel
The insert barrel of each extender is double-tapered to allow smooth insertion to, and removal from, a telescope's eyepiece holder, focuser or diagonal, however the wide dimension of the taper helps prevent the TeleXtender from falling out of the telescope should the set-screw holding it in place become loose.

Premium Quality
Opticstar TeleXtenders deliver research-quality images backed by a solid design, careful fabrication, multiple tests, and continued diligence to deliver a cutting edge, quality product.
Opticstar TeleXtender.
Shown left to right: 2" x2 XL TeleXtender, 1.25" x5 XL TeleXtender and 1.25" x3 XL TeleXtender.

Opticstar TeleXtenders
Specification 1.25" x3 TeleXtender 1.25" x5 TeleXtender 2" x2 TeleXtender
Barrel size 31.7mm 31.7mm 50.8mm
Objective lens 4 elements 4 elements 4 elements
Optical coatings fully multi coated fully multi coated fully multi coated
Height (approx) 98mm 104mm 113mm (w/out adapter)
Max. Diameter 45mm 45mm 70mm
Weight (approx) 195g 210g 630g (w/out adapter)

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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Opticstar News
New DS-616C XL+ Model
posted: 7th September 2021
Opticstar DS-616C XL+.
Star product, improved.

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.

DS-616C XL is Astronomy Magazine's Star Product
posted: 12th September 2013
Opticstar DS-616C XL is Astronomy magazine's product of the year.
Star product.

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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updated: 18th June 2019
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