Kowa-Cameras-Lenses-Catalogue-2024-KODE - Flipbook - Page 90
Our Lenses
Horizontal H (mm)
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Vertical V (mm)
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Diagonal D (mm)
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D
Camera
1/�″
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APS-C
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（Φ��）
″
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Vertical V
Image size varies across lens series and refers
to the area of the image that passes through
the lens and can be captured.
As long as the lens’s image size is equal to or
larger than the camera’s sensor size (see
figure at right), the lens is compatible and can
be used e昀昀ectively.
Image Sensor Size
Di
ag
on
Image Size
�/�"
Horizontal H
Focal Length
The imaging area is determined by the focal length, the
sensor size, and the working distance (W.D.), which is the
distance from the front of the lens to the object.
As shown in the figure at the right, the focal length is the
distance from the lens to the image sensor. A shorter
focal length results in a wider field of view, while a longer
focal length provides a more magnified view of the
object.
To achieve optimal imaging results, it is important to
select a lens with a focal length that matches both the
object size and the required working distance.
F-Stop (Aperture)
The brightness of a lens is indicated by its
F-Stop, calculated by dividing the focal
length by the e昀昀ective diameter of the lens.
This value can be adjusted using the
aperture.
Lenses with smaller F-Stops (brighter
lenses) allow more light to pass through,
enabling faster shutter speeds. On the other
hand, larger F-Stops (darker lenses) increase the depth of field, allowing a wider
range of the image to remain in focus.
F1.�
A large amount of
light enters the lens.
Sensor Size
Image Sensor
Object
F�.�
F�.�
Only a small amount of
light enters the lens.
Increase the
aperture size.
Depth of field refers to the range within which the image
remains in acceptable focus. It is in昀氀uenced by three main
factors: F-Stop, working distance (W.D.), and focal length. The
depth of field increases when the F-Stop is raised, the working distance is extended, or the focal length is shortened.
Adjusting these parameters allows for better control over
what portions of the image appear sharp.
Focal Length
Shooting Range
F-Stop (Aperture Value) = The size of the opening through
which light passes through a lens.
Depth of Field
89
WD
The F-Stop follows a standard sequence: 1.�, �, �.�,
�, �.�, and so on. Each step in this sequence
corresponds to halving or doubling the amount of
light that reaches the sensor. This is because the
F-Stop is based on the aperture diameter, and when
the radius of the aperture is reduced by a factor of
1/√�, the area through which light enters becomes
half. As a result, the light intensity is also halved.
Two times
brighter
Two times
brighter
� �.� � �.� � �.� � �� ��
Decrease the
aperture size.
Half
Half
Half
as
as
as
bright bright bright
Object
Sensor surface
Depth of Field
Depth of focus
When the lens aperture is stopped down.
Object
Sensor surface
Depth of Field
Depth of focus
