Specification

**Attention**

▶Germanium lens can have metallic luster, so that visible light is reflected and absorbed. Because of this, no transmittance occurs.

▶Germanium lens without an anti-reflection coating has a loss due to surface reflection. It causes that the transmittance is about 40%.

▶For the observation of infrared wavelengths, it is necessary to consider the effect of the radiation spectrum by temperature. In case of using in an environment of 30℃ or more, radiant light of infrared (near 9.6μm) is emitted from all substances, and it will not be able to properly observe the infrared spectrum to be observed.