Keeping the feature in focus
How often do you take a photograph of a feature but end up with a shot that
makes it difficult to work out what the centre of attention of the photograph is
supposed to be? This is where we can steal a trick from portrait photography.
The process is in essence the opposite of the previous technique. You want to have the specific subject of your photograph to be in clear focus while superfluous
background is out of focus to dramatically highlight the subject.
To adjust the depth of field you will once again set the camera dial to A or AV
(Canon) Now you can change the f-number, often by scrolling a dial or using
up/down buttons. You should be able to see the f-number change on the
screen.
Different cameras often have different available f-numbers, the rule is the
same. Small numbers i.e. f2.8 create a short depth of field where only the
main subject is in focus. So to ensure the feature (whether that is a cut or an
architectural element) is in sharp contrast to the background, choose an f-
number such as f2.8 – f5.6. If you have a ‘portrait mode’ you could also try to
see if it gives the results you need.
You can also reduce the depth of field by zooming in on the feature (only ever
use the optical zoom – do not use digital zoom!) and then standing
backwards (sounds daft… zoom in and then step back.. but the results are
worth it) Or, move closer!
TIP :
The closer you go to the subject, the less Depth of Field you will
get and the further away, the more Depth of Field will be obtained.
NOTE :
Large f-numbers close the hole in the lens, letting in LESS light. The camera must then compensate by taking a longer exposure, which can in turn increase the risk of camera shake. The higher the f-number the steadier you must hold the camera. Tripods are cheap light and useful in many situations.
