Hasselblad 70480542, 70380554, 70480522, 70490533, 70480532, 70380534, 70480533 Continuous, True Focus

H4D

Note though that in this mode the lens will focus at a distance and will remain focused at that distance while pressure remains on the shutter release button. In this way, you can focus on a nearby object for example, temporarily positioned within the focusing zone on the viewing screen and then without releasing pressure on the shutter release button, recompose knowing that the focus remains on the object chosen even though it is now outside the focusing zone. Releasing the pressure on the shutter release button and pressing again half way would now change the focus setting to the distance of the object within the focusing zone.

See Manual override in autofocus mode for a useful way of working with manual and autofocus settings in a combined manner.

Continuous

At Continuous setting (AF C), the shutter can be released rapidly before the lens is

focused­ in order to capture a split-second shot (in Single Shot, a capture cannot be made until the camera has had time to focus). However, the camera will continue to focus if a moving subject is within the focusing zone or if you recompose, even though the shutter release button is half pressed.

One method to exploit this feature when photographing in a rapidly changing situa- tion such as photojournalism, for example, is to keep the shutter release button pressed down. In this way the lens focuses constantly (according to the focusing zone) and by momentarily releasing the pressure on the shutter release and then immediately press- ing again, you minimize the amount of time needed for the lens to check focus, thus ensuring a split-second shot at optimum focus.

True Focus

The True Focus setting (AF T) is generally used in specific circumstances to automatically correct for camera angle/focus setting discrepancies but it can also be combined with other autofcus settings.

To be able to exploit True Focus correctly, a few important points should be studied in order to obtain a full understanding of how and when to use it. Basically, there are four variables to pay attention to listed below: (a) proximity of camera to subject, (b) focal length of lens, (c) aperture setting and (d) movement of camera and/or subject after ­setting. The closer you remain to the ideal situation with regard to these variables, the more noticeable the effect of True Focus will be.

a. The closer you are to the subject, the worse the original problem becomes. Conse- quently, the need for True Focus solution becomes greater and its application thereby becomes more noticeable.

b. Short focal length (wide-angle) lenses naturally decrease camera to subject distances and therefore, following the point in (a), produce a greater need for True Focus adjust- ments.

c. Smaller apertures increase the depth of field and therefore would lessen the need for a True Focus solution. However, smaller apertures produce a different visual effect, so True Focus therefore allows the exploitation of shallow depth of field without the fear of unwanted focus restrictions.

d. The mechanics of True Focus use, amongst other things, camera to subject distances to calculate the required amount of adjustment. It therefore follows that if the camera or the subject move after the initial setting has been made, the calculations will not be applicable anymore. So, to ensure the optimum correction, both the photographer and the subject should restrict movement as much as possible. Please note that with some lenses (particularly longer length lenses) just a few centimeters movement can essentially ruin the result.

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