LaFoto:
Thanks. For sure you're right about that. I noticed it too. Of course I have no recollection of taking the photo. I'm sure it was hand-held and I had to choose between less than optimum depth of field or camera shake. In that situation I'll nearly always opt for the faster shutter speed and larger aperture.
These days, I tend to carry a tripod more often.
It's a bit of an illusion, one tends to think that the top flower is closest to the camera (I guess because it's slightly larger), when in fact it must be the bottom one that's closest.
Despite the technical glitch, I still enjoy the flame-colored flowers against the pitch black background.
It's still raining here today, so I may be putting up some more old photos!
Thanks again for your observation.
DS