The Extra Color infrared conversion (665nm) The Extra color infrared conversion (665nm) has an effect between the 720nm and 590nm, producing more vibrant colors than the 720nm for pale yellow leaves and brighter blue skies.
When to get this conversion: Our favorite filter, this filter is best suited for processing to a traditional blue sky and white leaves, by desaturating the yellow in the leaves. This produces a look like the 720nm filter, but providing a richer blue that comes out more reliably between different cameras and different shooting conditions. Also a good choice for portraits. The shallow IR shows less veins than the deeper IR filters while still creating a dreamy look. May not be as sharp as the deeper filters do to increased chromatic aberration. Cameras with this infrared conversion can also add the 720 and 850 filter over the lens.