TOP 200 Telescopic Optical Probe

The TOP 200 has been completely redesigned and is currently based on Pritchard style optics with an integrated alignment camera. Typical uses for the TOP 200 telescopic optical probe include testing of displays and panel graphics. Unlike the previous model (TOP 100), all functions are now software controlled; manual operation is no longer required except for focus adjustment.

The Pritchard style optic allows the viewing area around the spot to be observed and monitored during measurements. The alignment camera produces an image which is then automatically imported by the SpecWin Pro software and saved with the measurement results.


  • With the Instrument Systems TOP 200 telescopic optical probe, image spots are delivered in a perfect, round shape with Pritchard optics and an aperture mirror with just 15DEG of incline (note that blur and ellipticity are often experienced with other manufacturers’ products)
  • Extremely low polarization sensitivity and reproducible results are guaranteed, thanks to our mode mixer, which is incorporated into the optical fiber connection
  • A wide viewing field is possible with the internal alignment camera
  • Able to measure spots as small as 80 um
  • An optional function allows the test object to be illuminated


Item Nr. Item Description.
Basic unit and fiber
TOP200-100 basic telescope unit with adapter for multimode fiber (w/o. lens and fiber)
TOP200-101 multimode fiber (diameter 1 mm) with mode mixer and PLG connector; 300-2200 nm
TOP200-102 UV multimode fiber (diameter 1 mm) with mode mixer and PLG connector; 190-1350 nm
Objective lenses and close-up lenses
TOP100-308 fixed focal length 28 mm; F/2.8; 370-1100 nm
TOP100-310 zoom 70-300 mm; F/4.2-5.8; 370-1100 nm
TOP100-311 fixed focal length 60 mm; F/2.8; 370-1100 nm
TOP100-312 fixed focal length 100 mm;F/2.8; 370-1100 nm
TOP100-313 fixed focal length 200 mm; F/4.0; 370-1100 nm
TOP100-316 zoom 200-500 mm; F/5.0-6.3; 370-1100 nm
TOP100-319 fixed focus 90 mm (HRL90); high resolution; 370-1100 nm
TOP100-322 UV lens 105 mm; F/4.0; 200-800 nm
TOP100-350 close-up lens; x4; 370-1100nm
TOP100-351 close-up lens; x2; 370-1100nm
TOP100-360 UV close-up lens; x4; 200-800 nm
TOP100-361 UV close-up lens; x2; 200-800 nm

The following table provides an overview of the spot sizes available with the 2 most important lenses:

TOP100-311, 60 mm focal length HRL90
Working Distance 180 mm 500 mm 1 m 230mm
Aperture *) Spot size [mm]
1 0.16 0.9 2.0 0.075
2 0.34 1.9 4.2 0.15
3 0.66 3.7 8.2 0.3
4 1.0 5.8 13 0.5
5 1.9 11 24 0.9
6 3.8 21 47 1.8
Camera field of view [mm]
Width 7.0 40 93 3.5
Height 4.4 25 59 2.2
*) Only apertures 1 to 4 can be used with the standard multimode fiber. Apertures 5 and 6 can only be used with the SPECTRO 320 in combination with a fiber bundle.

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