Tonight I spent quite a while taking stacks of an Itoh peony, straight on. It's a very deep flower, so I had to take about 20 shots for each of the two images I had in mind. After I stacked the first, I blew it up and examined it carefully for stacking problems. Instead, I found that what I thought was a tiny grain of dirt was in fact a tick nymph:
The nymphs are particularly frightening because they are truly tiny, and it would be very easy not to notice one attached to you.
I'll have to wear long pants and shirts with treated fabric in our garden now....