Extended User Manual – Irix 15 mm f/2.4
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HYPERFOCAL SCALE
Your Irix lens includes an innovative feature that
allows you to quickly focus your lens at the hyper
-
focal distance for apertures of f/8 to f/16. The hy
-
perfocal scale is located above the distance scale
on the lens barrel.
After selecting your aperture setting with your
camera in aperture Priority or Manual mode, sim
-
ply align the corresponding f/number on the hy-
perfocal sale with the center of focus indicator (the
center mark on the DoF scale). Your focus is now
set to the hyperfocal distance and there’s no need
to focus visually!
The landscape image to the left was taken using
the hyperfocal scale at f/16. Notice the overall
sharpness in the image.
Notes:
1.
When using the hyperfocal scale for several consecutive pho
-
tos, consider using the focus ring lock.
2.
The hyperfocal scale is calibrated for use with a full frame
camera. Using a camera with a smaller sensor will cause a shi-
ft in DoF and a corresponding shift in the hyperfocal distance.
With practice, you can learn to determine and compensate for
the difference.
