Nicely done... it is a real trick to get the exposure right in this kind of circumstance, and you nailed it. I agree the depth of field doesn't seem to match up with the f/20 aperture... that's a bit of a surprise to me. If I could suggest, a quick clean-up of the dust specks that appear in the sky would put the icing on this shot. Even with self-cleaning sensors, dust can still accumulate and it really shows up at f/16 and smaller. Congrats on the great capture... can't wait for the wildflowers to show up here in Alberta.