I've been using a 100mm 2.8 macro lens (non-USM) exclusively for portraits for the past few months. In comparing the results with pictures taken with the 135 f/2.0 in the past, I've noticed that the 135 has slightly lower contrast. Although I prefer the blur of the 135, slides taken with the 100 seem to have a snap that the 135 cannot approach. I'd like to hear opinions from others who have used these two lenses. Am I seeing differences caused by sample variation?

-- William Ju (wju@mediaone.net), April 21, 2001