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Leica M-series User Manual 122
Double Iris Aperture
The built-in double-iris diaphragm regulates
the depth of field. Note that:
The greater the depth of field, the darker
ρ
the image becomes.
In the same way, the exposure time
ρ
becomes longer for photographs.
The resolution decreases.
ρ
Adjusting the double-iris diaphragm using the
knurled ring