DEPTH-OF-FIELD

When the lens is focused on a subject at some distance, not only the subject but also a certain area around the subject will be sharply delineated in a photograph, and this area is known as a Depth-of-Field and has the following features.

a.The bigger the f-numher, the larger the Depth-of-Field.

b.The farer the distance at which the lens is focused, the

bigger the Depth-of-Field is.

c.When the lens is focused on a subject, the Depth-of-Field is bigger for the section in front of the subject than the area behind the subject.

d.The shorter the focal length, the bigger the Depth-of- Field.

The Depth-of-Field may be ascertained either with the depth-of-field scale or with the manual aperture. As for details, reference is made to the table of depth-of-field.

Using Table of Depth-of-Field: The Depth-of-Field Scale (7) is so calibrated that readings identical to those of the lens aperture are provided on both sides of the Distance Scale Index Mark (55). For example, let us assume that the distance between the film plane and the subject on which a 50mm f/1.4 lens has been focused is 15 feet. The Depth of Field will be 12 to 19 feet for f/4 and 8 feet to °° (infinity) f o r f/16 .

I N F R A R E D F I L M COMPENSATION MARK : T h e point of focus is somewhat different in infrared photography as compared to normal photography. After the lens has been focused as in normal photography, read the calibration on the Distance Scale (8) aligned with the Distance Scale Index Mark (55) and bring this reading in line with the Infrared Film Compensation Mark (56) before the shutter is released for a shot.

Depth-of-Field for f/16 for f/4

(55) Distance

(8)

Distance Scale

Scale

(56)

Infrared Film

Index Mark

 

Compensation

(7) Depth-of-Field Scale

 

 

Mark

(7)Schäfentiefenskala

(8)Entfernungsskala

(55)Index für Entfernung

(56)Ausgleichsmarkierung für Infrarotaufnahmen

(7)Echelle de profondeur de champ

(8)Echelle des distance

(55)Repère de distance

(56)Marque de compensation infra-rouge

(7)Skäpdjupsskala

(8)Avståndsskala

(55)Avståndsindex

(56)Avståndsindex för infraröd film

46

Page 46
Image 46
Konica Minolta T3 manual Depth-Of-Field