Hasselblad 70380534 Stop down / depth-of-field, Infrared focus settings, Focus assist 10, 11

H4D

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Lens focus setting too far beyond the distance of the subject framed by the central section in the viewfinder

Focus setting too close for the distance of the subject framed by the central section in the viewfinder

Focus setting correct

Depth-of-field can be calculated as follows:

1.Focus the lens as required.

2.Make an exposure reading (auto or manual) and note the aperture setting.

3.Find the markings on either side of the central index that correspond to the chosen aperture.

4.From these two markings, read off on the required lens distance scale the two corresponding distances.

5.The depth-of-field (at that particular aperture and focus setting) will be the area included between these two distances.

In the example given here, the focusing distance is set at nearly 3 metres. At an aperture of f/22, the depth-of-field would therefore extend from just over 2 m to approximately

4.5m. Note that depth of field is not an absolute. Perception of it depends on several factors and so it should be seen only as a rough guide.

Stop down / depth-of-field 8

A visual depth-of-field preview can be made by depressing the STOP DOWN button while viewing the image on the viewfinder screen.

Infrared focus settings 9

As infrared rays form an image at a different plane to that formed by visible light, the normal focus settings do not apply. Proceed as follows in manual focus mode:

1.Focus the lens in the conventional manner until satisfied.

2.Note the distance setting against the central lens index.

3.Re-align this distance setting against the infrared mark (coloured red) instead of the central lens index.

Alternatively if you have already calculated the required distance, you can make a

manual­ distance setting by using the distance scales together with the infrared mark instead of the central lens index.

For specialists, please contact your Hasselblad dealer for information about sensor units adapted solely for infrared photography.

Focus assist 10, 11, 12

As well as the conventional view on the focusing screen to ensure a sharp image, the H4D also features an LED focus assist capability appearing as two arrowheads to the right of the viewfinder display (except for lenses with a maximum aperture of f/6.7 or smaller). The arrowheads provide confirmation of a precision focus setting and are a useful aid when making a setting with eyesight alone.

Manual focus setting

When the left arrowhead alone appears it means the focus setting is too far beyond the chosen distance (the area framed within the central zone in the viewfinder) and when the right arrowhead alone appears it means the focus setting is too close. Focus is ­correct when both arrowheads appear together. If the focus cannot be established, then both arrowheads flash.

Automatic focus setting

Focus is correct when both arrowheads are visible together. Focus is incorrect if only one arrowhead is visible. If the focus cannot be established, then both arrowheads flash.

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