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Depth-of-field░22░
Depth-of-field – the amount of acceptable sharpness produced at a given aperture and focus setting – can be calculated as in the following example:
The aperture has been set at f/11 and the focus at 3 metres. By reading across from the relevant aperture markings on the depth-of-field scale on either side of the central index to the focusing distance scale, you can see the extent of the sharp zone. In this example the depth-of-field ranges from approx. 2m to 7m.
There are two tables at the end of the illustration section of this manual that describe the depth-of-field produced by the various combinations of aperture settings and focus settings regarding 45mm and 90mm lenses. For example, when focused at 2m and set at f/8, the depth-of- field extends from 1.61 to 2.66m with the 45mm lens and from 1.89 to 2.13 with the 90mm lens. See separate user manual for 30mm depth-of-field table.
Viewfinder
The viewfinder is a coupled rangefinder type with the additional feature of automatic field-of-view frame change according to the focal length of the lens and chosen format. The field-of-view frame also moves automatically to compensate for parallax error when photographing close subjects. The 90mm lens produces a larger rangefinder double-image compared to the 45mm lens. The viewfinder eyepiece is interchangeable to suit individual eyesight.
Changing the viewfinder eyepiece | ░23░ |
The standard dioptre of the viewfinder eyepiece is -1.0. Five other strengths are available: +2D, +0.5D, -2D, -3D and -4D. The eyepieces simply slide in and out of the viewfinder frame, clicking into position and secured by the locking device. Pushing the locking device button and simultaneously sliding the eyepiece from its locked position can release it.
Please refer to the 'Viewfinder eyepiece selection' table towards the end of this manual for a detailed description of choice.
