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ImageMaster® Afocal

Telescope test bench

ImageMaster® Afocal

Image quality testing for telescopes, riflescopes, binoculars and spotting scopes

Afocal optics, such as those used in riflescopes, are often still tested today using purely visual test procedures. The results are therefore based on the subjective assessment of the tester and thus the repeatability of the measurement results is not guaranteed. Due to the multitude of determining factors, subjective quality testing often reaches its limits even among the most experienced professionals.

With the ImageMaster Afocal® optical afocal systems like telescopes, riflescopes and binoculars are tested in terms of functionality and image quality with a variety of specific optical parameters.

  • 1Precision

    Does it really make sense to rely solely on subjective quality assessments in the field of afocal optics, where maximum precision is required? Numerous parameters such as chromatic aberrations or knowledge of the exact magnification are decisive factors for quality assessment. The precise measurement of these parameters is an essential precondition for perfect functionality.

  • 2Flexibility

    The ImageMaster® Afocal telescope test bench is designed for testing the image quality of afocal samples such as telescopes and riflescopes. Options and suitable sample holders allow the measurement of binoculars and spotting scopes.

  • 3Operator independent

    The horizontal measurement device has been specially developed for precise and automated measurement of the image quality (MTF and further parameters) of afocal optics. The image quality is determined objectively and thus operator-independently.


The measurement process with the ImageMaster® Afocal is manual or fully automated. The measurement is possible for finite and infinite object distances. A wide range of parameters such as the MTF or magnification are already measured in the standard configuration. Specific measurements such as parallax (free distance) can be easily performed with a focusable collimator. Measurements of other specific parameters, such as the eyerelief of riflescopes and spotting scopes or the subjective and objective field of view, can be performed with upgrades.

Measuring parameters ImageMaster® Afocal

Technical Data

Parameter ImageMaster® Afocal
Spectral Range 450 … 750 nm
Clear Aperture 2 mm … 110 mm (depending on collimator)
Illumination Sources Halogen light source / LED panel
Max. off-axis object angle ±15 °
Max. off-axis image angle ± 90°
Magnification 0.5x … 60x
(MTF on-axis and off-axis)
± 0.02 MTF on-axis / ± 0.03 MTF off-axis
(MTF on-axis and off-axis)
± 0.01 MTF
Object distances 20 m … ∞ for parallax / 100 m … ∞ for MTF
(h x w x d)
253 mm x 1,782 mm x 627 mm
Weight approx. 185 kg
Type Table-top unit
Download Technical Data


  • MTF-Lab for ImageMaster®Afocal

    Measurements of MTF, magnification and a range of other parameters using special target patterns and dedicated software routines

    Functions for easy alignment of the sample under test

    Conventional MTF measurement using a single slit or a crosshair as a target

    Automated selection and positioning of the suitable reticle (target) and filter for the current application

    Configuration files with optimized process parameters and password protected access for operator and supervisor

    Scripting tools for customer specific programming and analysis

    Intuitive user interface and time-saving lens test routines

    External control via TCP/IP

Upgrades & Accessories

In order to meet individual requirements, the test bench is available with various upgrades. The result are flexible configuration options for measurement of different specific parameters of optical afocal systems, for instance the subjective as well as the objective field of view. Another important parameter, especially for riflescopes and spotting scopes is the eyerelief. It rounds up the versatile measurement functionality of the ImageMaster® Afocal. Additional options and sample holders allow the measurement of binoculars and spotting scopes.

  • Sample mounting of binoculars

  • Sample mounting of spotting scopes

Knowledge Base

  • ImageMaster® Afocal

    Image quality testing of optical afocal systems

    The ImageMaster® Afocal measures at infinite and finite conjugates. A collimator (A) simulates a distant object which may be located at infinity or some closer distance. A motorized video telescope (C) views the image created by the sample (B).

  • More knowledge for experts

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  1. Measuring principle of the ImageMaster® Afocal

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