Aperture Range Graph - Sony HVL-MT24AM Operating Instructions Manual

Aperture range graph

The aperture range for macro lenses is displayed on page 26 (TTL), and page 34
(Manual flash). The aperture ranges described here are for lenses other than macro
lenses, or when the subject distance is large.
TTL flash metering
Flash-subject
distance
The following explains how to obtain the aperture range using the two twin flash
units with a 1.5 m flash-to-subject distance and at ISO 100.
1 Draw a vertical line upwards from the flash-to-subject distance until it reaches
the minimum aperture line ().
2 Draw a horizontal line leftwards from  until it reaches the vertical ISO line
corresponding to the camera used ().
3 Draw a diagonal line from  upwards and leftwards. The result indicates the
minimum aperture that will provide the proper exposure ().
4 The maximum aperture can be obtained in the same way by using the maximum
aperture line ().The results of both calculations will give the usable aperture
range for obtaining the proper exposure ().
In this case, the proper exposure can be obtained by setting the camera's aperture
from maximum to f/16.
 The dotted lines are employed when only one twin flash unit is used.

Min. Aperture lines Min. Aperture lines
Max. Aperture lines Max. Aperture lines