40x objective focus stacked in Zerene.
Brightfield

UGF

Moderators: rjlittlefield, ChrisR, Chris S., Pau
Universal Gradient Filter. The standard reference is http://www.photomacrography.net/forum/v ... 5832#95832 and discussion in the thread that surrounds it, "Gradient Universal Filter - 'DIC', DF, OL effects".leonardturner wrote:what is UGF illumination?