Precision optronic solutions
Design and manufacture

Beck Optronic Solutions designs and manufactures integrated optical systems to the most exacting technical standards

We have unrivalled experience and expertise to draw upon – no matter what your requirement, you can be assured that we will previously have successfully tackled a similar optical challenge

Reflecting Objectives

Reflecting objectives are renowned for their unique optical properties. Beck Optronic Solutions is one of very few companies worldwide designing and manufacturing them.

Please visit our Technical Data page for interface drawings, user manuals etc

Beck Optronic Solutions is proud to be the manufacturer of the Original Beck/Ealing Reflecting Objectives. Based on a two mirror system reflecting objectives were originally designed for microscopy in 1904.The all reflecting optics means that, in contrast to refracting objectives, they are totally free from chromatic abberations. The BOS objectives are based on the work of C. R. Burch, who in his 1947 paper, showed that by careful selection of the mirror curvatures and their separation, they are corrected for spherical abberation, coma and astigmatism, leading to diffraction limited performance. In addition to these corrections, reflecting objectives have the following advantages when compared to standard refracting microscope objectives:

  • Longer working distances relative to the magnification;
  • Large numerical apertures for improved light gathering power;
  • High throughput from UV to far infrared;
  • Coatings available to enhance performance at specific wavelength regions;

Applications include conventional microscopy and beam delivery systems. With their unique lack of chromatic aberrations they excel especially where a dual wavelength operations is required, such as alignment to a visible beam for working with an IR or UV beam laser. Other uses include:

  • Two-photon microscopy
  • FT-IR spectroscopy;ROG.png
  • UV metrology and microscopy;
  • Semiconductor wafer inspection;
  • Photomicroscopy;
  • Photolithography;
  • Thin film measurements;
  • Laser beam delivery systems;
  • Laser drilling and etching;
  • Product marking;
  • Laser pumping;
  • Thermal imaging microscopy.

 Reflecting Objective 1.jpgBOS Reflecting Objectives are available in six standard models as detailed below, or can be fully customised as required.


The standard reflecting objectives are supplied with aluminium coated mirrors. This gives the widest spectral coverage from UV to far IR, but limits the objective to low power use only. In applications requiring high power, BOS offers alternative coatings as detailed below. For specialised applications we can provide other specialist coatings.

Reflecting Objective 3.JPG

Note: Our standard objectives have a 3 legged spider (to support the secondary mirror) which minimises diffraction but produces a six point flare pattern. A 4 legged spider produces more diffraction but only has a 4 point flare pattern and some users prefer this. Add postfix 4 to part number for a 4 legged spider when you order (3 legs are supplied as standard).

Notes: If back reflections may be an issue in your application a matt black dimple can be ground into the secondary (smaller) mirror. Add postfix -D to the part number.

If you require a clearance hole through the secondary mirror please contact us to discuss the options available.


Please visit our Technical Data page for interface drawings, user manuals etc

Distributors for Reflecting Objectives:

France, Belgium, Luxembourg & The Netherlands

Germany, Austria & Switzerland




South Korea


Worldwide, non-exclusive

Reflecting Objective Datasheet





Beck Optronic Solutions Limited

Beck Optronic Solutions has a history of designing and manufacturing precision optical solutions going back to 1839. Based near London, UK, BOS has comprehensive engineering capabilities across UV, visible, near infrared, thermal imaging and CO2 laser wavebands, and serves defence and commercial Clients worldwide.

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