Heliopan RG715 (88A) Infra Red Filter. 39mm to 105mm thread sizes.
Heliopan RG715 (88A) Infrared Filter. The RG715 is equivalent to a Wratten 88A filter and is visibly opaque. It passes through light in the 715nm range. Heliopan filters made from Schott glass, pass only the exact areas of the IR Spectrum.