Thanks for your reply - since I haven't been using EF lenses I wasn't aware of that. If they already have the DO technology worked out with sharp images and smooth bokeh then I wonder why they're not using it in all of their new lenses? Could it be that these two RF DO (non-L) lenses are the beginning of a trend towards DO in everything? Or is there some issue still in the IQ or cost that we're missing that keeps them from being in the RF L versions?The 400 DO version 2 is very-very sharp from what ive seen and bokeh looks smooth. I'm curious how it compares to the 400 2.8 at F4.
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