Technical Data
16 Rev. E2 04/2011 Marathon MR
3.5 Optical Specifications
Optical Resolution D:S (assumes 95% energy at the focus point)
MR1SA 44:1
MR1SB 82:1
MR1SC 130:1
Because the sensor has variable focus, through-the-lens sighting, and parallax-free optics, it can be
mounted almost anywhere. SF (Standard Focus) models can be focused from 600 mm (24 in) to
infinity, and CF (Close Focus) models can be focused from 300 mm (12 in) to 600 mm (24 in). For
1-color temperature measurements make sure the target completely fills the measurement spot. The
spot size for any distance, when the unit is properly focused, can be figured by using the following
formula and Figure 8.
Divide the distance (D, in Figure 8) by your model’s D:S number. For example, if a model C unit (D:S =
130:1) is 2000 millimeters (80 inches) from the target, divide 2000 by 130 (80 by 130), which gives you a
target spot size of 15 mm (0.6 in). A model A unit (D:S = 44:1) at 2000 mm (80 in) would measure a
target spot of 45 mm (1.8 in). Divide 2000 by 44 (80 by 44).
Figure 8: Spot Size Chart
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