Leica M Instruction Manual page 174

Bright-line frames on a viewfi nder camera must be matched to the
image angle of the relevant lens focal lengths. However, the nominal
image angles change slightly when focusing due to the changing
extension, i.e. the distance between the optical system and the
sensor plane. If the set range is less than infi nity (and the extension
correspondingly greater), the actual image angle is smaller - the lens
captures less of the subject. In addition, the diff erences in the image
angle tend to be greater at longer focal lengths, as a result of the
greater extension. In the middle of the viewfi nder image is the square
range metering image, which is brighter than the surrounding image
fi eld. If the exposure meter is turned on, the exposure meter LEDs
and the fl ash symbol LED appear at the lower edge of the viewfi nder
image.
For more details about setting the range and exposure metering, as
well as fl ash mode, refer to the relevant sections on p. 174/ 179.
A
All pictures and bright-line frame positions relative to 50mm focal length
A
B
Set to 0.7m:
Set to 2m:
Set to infi nity:
172
Bright-line frame
Actual image fi eld
The sensor detects approx. one frame width less.
The sensor detects exactly the image fi eld shown by
the inner edges of the bright-line frame.
The sensor detects approx. 1 or 4 (vertical or
horizontal) frame width(s) more.
B