Home › Filters › Bandpass › Bi650

#C52035 Bi650 Red Interference Bandpass Filter

Useful Range : 643-665nm
FWHM : 30nm
Tolerance : +/-5nm
Peak Transmission : ≥85%
Surface Quality : 40/20

Bi650 Transmission Data (Typical)

wavelength (nm)	transmission (%)

wavelength (nm)	transmission (%)

Filter Mount & Size Options

Threaded Mount

for lenses with filter threads, learn more

Unmounted & Custom Size

for custom size, learn more

select shape

Learn about MidOpt mount solutions

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. Filters 62mm and greater have a surface quality tolerance of 60/40.