Using depth blur in the NXT image editor?

HI all

I have been experimenting with using depth blur post render in the image editor, it seems a much more efficient way of creating blur rather than having to keep testing when rendering.

However every time I have tried this the depth blur seems to be more a haze than a blurring of image (see below) is this correct ? The affected area seems to be lightened rather than blurred.

Thanks

Boothy

PS it would be useful to have the focal distance output in metric