MidOpt SP Sereis – NIR Block Filter SP645

Salient Features

Near-IR/Mid-Red Dichroic Block Shortpass Filter

Our most popular near-IR blocking filter for inside-the-camera applications. Also referred to as an “infrared cut filter”, these filters limit the amount of infrared radiation that reaches delicate CCD and CMOS sensors. Near-IR blocking is unusually exceptional in the case of these filters. CCD/CMOS imagers are very sensitive to infrared radiation and, often, deep red wavelengths as well. Using a SP645 filter will reduce or prevent a reddish, washed out coloring of the final image. These filters are 1mm thick.

 

SP645 Near-IR/Mid-Red Dichroic Block Shortpass Filter

• Useful Range : 400-640nm
• Cut-off Wavelength 50% T : 645nm
• Tolerance : +/- 10nm
• Minimum Peak Transmission :≥90%
• Surface Quality : 40/20

The performance of a filter is based on what happens to light passing through the filter. The apparent color of light reflected off the surface is not a reliable way to judge the filter’s capabilities. Batch-to-batch difference in the apparent color of the coatings or filter substrates can often be easily seen when looking at two examples of the same filter type. The color of the coating does not indicate a disparity in performance.

 

The performance of a filter is based on what happens to light passing through the filter. The apparent color of light reflected off the surface is not a reliable way to judge the filter’s capabilities. Batch-to-batch difference in the apparent color of the coatings or filter substrates can often be easily seen when looking at two examples of the same filter type. The color of the coating does not indicate a disparity in performance.

Application Note: SP645 App Note PDF