It's not really so much as foreground and background as it is a plane of focus. think of a picture as a rectangular box (or cube, if you're shooting 6x6). Well the in-focus part will be a slice of it. The larger the aperture, the thinner the in-focus area.
The larger your aperture, the more blurred the background will be. Sharpness of the infocus area will vary depending on your lens. Which lens' are you using?
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and just in case you arent familiar with aperture. larger means f1.8, 2.8, 4, not f16, 22.
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thanks very much guys, much appreciated.
hopefully one day ill be able to show you what ive taken - im new to the game and am just being taught how to develop and print my negs, sometimes it gets a bit confusing!