Technical Data
Optical Specifications
13
3.4.1. Measurement spot size regarding the selected focus and model options
The properties of Endurance devices with an integrated sensor head are:
• Variable focus
• Through-the-lens sighting/pointing option (LED, LASER, Video-Camera)
• Parallax-free optics
• May be mounted almost everywhere
Three variable focus distances are optional orderable:
• F0 (Narrow Focus) models can be focused from 190 to 300mm (7.5 - 12'')
• F1 (Close Focus) models can be focused from 300 to 600 mm (12 - 24'')
• F2 (Standard Focus) models can be focused from 600 to infinity (24'' - infinity)
For measurements performed in the 1-Color mode, make sure that the target completely fills
the measurement spot. The target spot size for a properly focused target with the given distance
to the target can be determined by using the following formula.
Divide the distance (D) in the picture below by the (D:S) specification to get the target
spot size.
Example for an E1ML device (D:S = 160:1) under different focus options:
• F0: 190 – 300mm The measurement spot diameter varies from 1.1875 – 1.875mm
• F1: 300 – 600mm The measurement spot diameter varies from 1.875 – 3.75mm
• F2: 600 – 3000mm The measurement spot diameter varies from 3.75 – 18.75mm
Figure 2: Spot size calculation regarding the distance to the integrated sensor head
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