Originally posted by mlag I understand aps-c, FF, and IR...
But ultra violet is new to me... I suppose its more than an uv filter?
UV filters EXCLUDE light below purple. It is not visible to our eyes but is to film. In film the UV filters are used to exclude haze caused by it in distance shots, particularly at higher elevations.
UV photography is the opposite of that. It seeks to capture UV and exclude everything else.
The mix of light that reaches the surface of the earth is about 50% IR, 48% visible, and 2% UV. UV is what some animals see such as bees and flowers have developed patterns that can only be seen in UV to attract them.
It is a harder discipline to learn than IR or visible photography and I have have just started.