For flower close-ups, I use a macro lens, extension tubes, diopters, tele-converters, etc, whatever gives me what I need - including a telephoto lens.
This image is an example of using a 300mm lens at its minimum focusing distance: wide open (lowest f/number) at about 4 1/2 feet. The relatively close focusing distance is what accounts for the very shallow depth of field and selective focus. A long lens compresses scenes like this, where the red is literally in a different garden across the grounds, creating a soft color palette around the sharp part of the flower.
Also worthy of note is that you really don't need to make sure the out-of-focus area is only behind the subject. The large out-of-focus flower to the lower right is in front of the main subject, but appears as soft as the background flowers. What is important is that there be some distance between the sharp flower and the others (in back of and in front of the subject).
Even though I used only an unaltered 300mm f/4 lens for this shot, I often add attachments - such as extension tubes, close-up diopter, or teleconverter. It all depends on the image and how far the foregrounds and backgrounds are to the subject.
Note: When shooting wide open, I use autofocus to find an edge. This ensures minimal sharpness.
More info from the blog editor: Master the art of creative photography from nature photographer Tony Sweet. Check out his photo workshops online - including ones on fine art flower photography and creative vision - that he teaches at the BetterPhoto digital photography school.
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