72 UV-IR -

The filter is therefore not suitable for lens systems with
an angle of view of more than 60°.

Please note however that, in contrast to mass-colored (integrally colored) filter
glass, the UV-IR barrier filter is based on thin-film technology. More than 30
interference coatings are vapor-deposited on one side, while the opposite side is
MRC-coated. In wide-angle lenses, the laws of physics lead to shallower
incidence angles for peripheral rays. For geometric reasons these rays have to
travel further through the interference coatings than rays traveling vertically
through the coatings in the centre of the lens. With increasing angle of
incidence, this leads to a change in light color towards blue. This effect can
clearly be seen by looking at an UV-IR barrier filter from an angle. The color of
the reflected light changes, with a similar effect on the light traveling through the
filter.