Open the aperture on the lens, ie. use a low number such as f2.8 or 4 and correspondingly raise your shutter speed. Working on a telephoto lens from further away can also enhance the effect.
Manual or Aperture Priority.
Depth of field in photography is 3-dimensional and is measured from the foreground moving along a horizontal plane towards the background. Maximum depth-of-field means most of the scene is in focus and shallow depth-of-field means the minimum is in focus. Shallow depth-of-field lets you lose the background into a nice blur leaving the foreground in focus - good for portrait photography. In landscape photography you would normally choose the maximum depth-of-field so that distant hills were in focus as well as the middle ground and the foreground - in other words, everything in the field of your vision would be sharply focussed.
yes
If you set your camera to aperture priority (usually the "A" on the program dial) and select a large aperture, say, f2 to f4, then the resulting image will have less depth of field than at, say, f11. The lens always affects how wide you can open the aperture, but the depth of field is not dependant on the lens other than this.
Infinite, with a suitable lens. In theory, a pinhole camera (which has no lens at all) will have a nearly infinite depth of field, but at the expense of extremely long exposure time.
Scanners are capable of making 1:1 images, with a great deal more detail than a camera. The disadvantages are very shallow depth of field, inability to image things away from the scanner surface, huge file size and, of course, limited portability.
With a 100mm macro lens, as little as a few millimeters, even when stopped down to F16.
Generally, you can with all cameras. All you need is a shallow depth of field. You can achieve this by using a low aperture (ex. f/2.8, f/1.8) The lower the f/#, the shallower your depth of field will be.
Well the depth of field is very important while studying biological structures because most of the times you'll be examining species that can be very very tiny, so it's needed in order to see a up-close image of the specimen A shallow plane of depth you can only see one plane of your speciman.
Aperture on a camera is the size of the opening/hole in the lens that allows light through. A larger opening lets more light through per second than a smaller one. The size of the opening also affects the depth of field (DOF) in the photograph in the following way: Large opening ------- Small opening Shallow DOF ------- Deep DOF See these links for more detailed info. Aperture http://en.wikipedia.org/wiki/Aperture Depth of field http://en.wikipedia.org/wiki/Depth_of_field
the F numbers usually refer to the aperture of the lens which controls how much light can enter the camera. it also affects the depth of field.
See the answer to "Why do you get a greater depth of field from a smaller aperture"There's also a great article on it at: http://www.uscoles.com/depthoffield.html