Heliopan Infrared Filtreler
Heliopan offers IR filters made from Schott Glass, which only pass exact areas of the IR spectrum.
The following are available. Please refer to chart below for the exact properties.

RG 610
RG 630
RG 645
RG 695  (89B)
RG 715  (88A)
RG 9
RG 780   (87)
RG 830  (87C)
RG 850
RG 1000

When using Color IR. film without a filter the color will be violet color. The following color shifts are achieved with filters.

Yellow # 12
green becomes blue.
Red becomes green.
Yellow becomes blue.
Infrared becomes red.