The View Finder is an optical tool to determine the field view of a lens.
1 To determine the field of view of existing lens.
Select the correct camera format scale, then rotate the View Finder barrel unit the dot
coincides with the lens focal length.
The object viewed through the finder is the same as seen by the camera.
Example : In the case when the camera format is 2/3"and the focal length of the lens
is 12.5mm, adjust the
barrel as shown.
2 To determine what focal length lens to use
First, look the object thought the finders window, then turn the barrel to find the desired field of view.
Next, using the correct camera format scale, read the lens focal length which coinciders
with the dot on the barrel.
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