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Depth-of-Field is an outcome of focal-length and aperture, and obtainingdifferential-focus becomes more difficult with small image-sensors, the reason being, that with the reduced focal-lengths which smaller image-sensors call for, comes greater field depth as a natural outcome. The obvious ‘cheat’ is to use a neutral-density filter, when, everything else being equal, the depth-of-field will be reduced by the wider aperture the lens has to open up-to, to compensate.Another solution is to useshots and angles which allow for tightly ‘cropped’ images, thus working more of the time inthe medium-focal-length/telephotoportion for your lens’s performance-range. I have had considerable success doing that against backgrounds which are far enough distant to have gone very much out-of-focus. It doesn’t call for any special gear, just tight image-cropping and a ‘different’ way of going about things. Works great for screen-filling close-ups of bumble-bees on ice-plant flowers, (an actual recent instance of mine), not so sure about weddings, though.
In extreme close-up situations, of course, limited depth-of-field/differential-focus, are also problems, but then, they tend to work against you, not to your advantage.