Hi Peter, I've used all my lenses from 20mm to 180 successfully, and I'm looking for a 300 2.8
I'm don't think there is a problem going with anything wider, if the image overs the groundglass you should be in business.
Im wondering which is best wide angle for the EX1?
I think the 20mm might have some distortion (which can be cool) but what would be the preferred size if there was one choice.Is it best to get a lens for the letus? or a screw on adapter directly to the EX1 lens?