The Cokin A195 Rainbow 1 filter is a special effect-filter with which you can make a rainbow appear in your image. The filter is at its best when used on wide-angle lenses. It is also recommended to use an aperture between f/8.0 and f/11 for optimal rainbow visibility.
The Cokin A series
The filter has a size of 66 by 72 millimeters and is suitable for use in the Cokin A series filter holder. The A195 filter is also easy to combine with other filters from this filter series. Two rainbow filters are available: A195 and A196, with A196 being one-third larger.