Lumicon Infrared Filter
The Lumicon Infrared Filter is used primarily to "bracket" the color-corrected band of refracting telescopes,available in 1.25" and 2".
The Minus Violet and Infrared Blocking Filters can also be used as "visible" filters in RGBV (red-green-blue-visible) astrophotography with reflecting telescopes. The larger Minus Violet filters are for telephoto lenses.
Most digital/CCD cameras have built-in infrared filters, in which case either the Minus Violet or Infrared filter may be used.
The choice would depend on how far into the blue your primary lens is color-corrected.
The Minus Violet filter blocks wavelengths shorter than about 420nm; the Infrared filter blocks wavelengths shorter than about 400nm.
If your camera does not have a built-in infrared filter, the Infrared Blocking Filter is recommended, which blocks all wavelengths longer than 750nm.
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