Sekonic Speedmaster L-858D-U Light Meter - Manual (Page 54)

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4. Basic Operations
3) Measuring Area
The measuring area is the inside of circle in the
viewfinder.
The light receiving angle is 1 degree.
4) Diopter Scale Compensation
While looking through the viewfinder, adjust the diopter by
rotating the Viewfinder Eyepiece
4
so that the circle and
digital display can be seen clearly.
(The setting range is -2.5 to 1.0 D.)
WARNING
Be careful not to directly look at the sun or bright light sources during
measurement.
This may cause a serious eye injury or lead to blindness.
NOTE
<<Step-up ring>> (Accessory sold separately)
You can attach a filter to the objective lens side using the step-up ring
(30.5 mm → 40.5 mm). This allows you to determine the exposure without
specifying the filter compensation value of the PL filter, etc., which is a
burdensome task.
The step-up ring can also be used as a hood to protect the lens part from
damage or dirt and prevent an incorrect measurement due to lens flare or
glare. (  P196)
Viewfinder Display
Circle
Viewfinder Eyepiece
4