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Lenscare dof tutorial
Lenscare dof tutorial







Standard LensesĪ camera salesperson may tell you that a 50 mm lens is similar to the human eye. A prime lens has a single focal length (e.g., 24 mm) while a zoom lens can change focal lengths through a specific range (e.g. Lenses also come in two forms prime lenses and zoom lenses. Another of those technical definitions (that you really don’t have to remember) is that the focal length of a lens is the distance between the lens and the image sensor when the subject is in focus it is usually stated in millimeters (e.g., 28 mm, 50 mm, 100 mm). Beyond that are lenses which have more specialized uses, such as fisheye, shift/tilt, macro, and others.

lenscare dof tutorial

Lensesīroadly speaking, there are three general types of lenses, predominately identified by their focal lengths: standard, wide, and telephoto. But a wedding photographer might want to insure that, in an outdoor portrait of a wedding couple, that only the couple is in complete focus while the background is allowed to go soft. For instance, a landscape photographer might be very interested in having everything in the frame of an image, from the closest object to the furthest, be in focus. This is probably a good place to note that the desired DOF can vary depending upon the creative objective of the photographer. As a reminder, DOF refers to what is acceptably in focus (i.e., not obviously blurry sometimes also referred to as “soft”) both in front of, and beyond, the photographic subject.

lenscare dof tutorial

To put it very succinctly, DOF is also affected by (a) distance between the camera and the photographic subject and (b) the focal length of the lens being used. I thought it important to correct that impression soon (which I also hinted at in the ending of my most recent post about my photography on our Maui vacation). Unfortunately, that may have left the impression that DOF is only affected by aperture. In the previous photography tutorial post about Exposure, one of the subtopics discussed was Depth-of-Field (DOF) because aperture, one of the components of exposure, can have a pronounced affect upon it.









Lenscare dof tutorial