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A colour blender glass filter is the same as a colour graduated glass filter, but with the transition taking place gradually over the whole length of the filter rather than in the middle. Blender filters are available in all colours as per graduated filters.
Colour graduated glass filters create an effect in the top part of the image while leaving the bottom undisturbed. Accordingly these filters are most commonly used with skylines. Dramatic effects can be achieved using coloured graduated filters.
Colour graduated glass filters are available in Soft edge, Hard edge or Razor edge varieties. Soft edge grads have a smooth transition from clear to the colour. Hard edge filters have a more defined hard lined transition and should be used for longer lenses. For extremely long focal lengths a Razor edge grad, providing a very highly defined transition, may be ordered. Interesting effects can be achieved using two different graduated filters, (one upside down) one of which affects the top half of the image with the other affecting the bottom half.
Coral Filters can be considered as both Colour Correction and Colour Effects Filters and are used to warm up cool lighting situations such as overcast days.
Coral filters are available in densities 1/8 to 5 and are ideal for maintaining a consistent colour balance throughout a whole day of shooting or to create a sunset or dawn effect at any time of the day.
