My aim was to get a photo of the bud with a dark background. I set the aperture at f/5.6, and I see from the Properties that the shutter speed is 1/125 - yes I was following a book from the public library to work this out, though I had to make adjustments myself also. The book said that the background would be dark and the flower bright. I found the background wasn't dark enough; I could still see the trellis and - worse - the rubbish bins behind it. So I used a technique I learnt from another book from the public library: that is, to aim at a bright area, press the AE/AF lock which will not only set the focal length for the image but also the exposure. Being aimed at an overbright area, it compensated by darkening. I then swung back to the bud - which being in full sunlight stayed bright, but the background being in shade became dark, and clicked.