Optical filter

An optical filter comprising:

• a substrate;
• and
• a dielectric multilayer film (A) laid on or above at least one main surface of the substrate as an outermost layer, the dielectric multilayer film (A) being configured to reflect a light in a wavelength region of 900 nm or more, wherein
• the substrate comprises a resin film comprising a resin and a dye (I) having a maximum absorption wavelength of 700 nm to 800 nm in the resin,
• the optical filter transmits a visible light and a light in at least a partial wavelength region of 750 nm to 1000 nm, and
• the optical filter satisfies all of the following spectral characteristics (i-1) to (i-9):
• (i-1) when a side of the dielectric multilayer film (A) is set as an incident direction, in a spectral reflectance curve at an incident angle of 5 degrees, a wavelength IR50(R) at which a reflectance is 50% is in a range of 900 nm to 970 nm;
• (i-2) in a spectral transmittance curve at an incident angle of 0 degrees, a wavelength IR50(L) at which a transmittance is 50% is in a range of 780 nm to 850 nm;
• (i-3) an absolute value of a difference between the wavelength IR50(R) and the wavelength IR50(L) is 110 nm or more;
• (i-4) in the spectral transmittance curve at the incident angle of 0 degrees, an average transmittance T440-600 (0 deg)AVE in a wavelength of 440 nm to 600 nm is 86% or more;
• (i-5) in the spectral transmittance curve at the incident angle of 0 degrees, an average transmittance T700-800 (0 deg)AVE in a wavelength of 700 nm to 800 nm is 5% or less;
• (i-6) in the spectral transmittance curve at the incident angle of 0 degrees, an average transmittance T840-870 (0 deg)AVE in a wavelength of 840 nm to 870 nm is 88% or more;
• (i-7) in the spectral transmittance curve at the incident angle of 0 degrees, an average transmittance T950-1200 (0 deg)AVE in a wavelength of 950 nm to 1200 nm is 5% or less;
• (i-8) in a spectral transmittance curve at an incident angle of 40 degrees, an average transmittance T840-870 (40 deg)AVE in a wavelength of 840 nm to 870 nm is 70% or more;
• and
• (i-9) an absolute value of a difference between IR50_780-850(0 deg) and IR50_780-850(40 deg) is 8 nm or less, where the IR50_780-850(0 deg) is a wavelength at which a transmittance is 50% in a wavelength range of 780 nm to 850 nm in the spectral transmittance curve at the incident angle of 0 degrees, and the IR50_780-850(40 deg) is a wavelength at which a transmittance is 50% in a wavelength range of 780 nm to 850 nm in the spectral transmittance curve at the incident angle of 40 degrees.