From under- + focus. <span class="searchmatch">underfocus</span> (uncountable) The state of a microscope that is focused slightly in front of the specimen 2015 August 7, Ad de Groof et...
overfocus perifocus prefocus pull-focus retrofocus self-focus soft focus <span class="searchmatch">underfocus</span> virtual focus in optics in mathematics fact of the convergence of light...