Yashica CS 250 AF [17/33] Using the focus lock

· In the manual-exposure and shutter-priority auto exposure modes the shutter speeds can be set in 1-step increments, and the

apertures in 1/2-step increments. Intermediate setting is impossible.

· If the exposure mode is "PROGRAM", "Tv" or "Av", the lens' smallest-aperture value will blink when the subject is overexposed

relative to the correct exposure measured by the camera; and the maximum-aperture value will blink if it is underexposed.

Using the Focus Lock

If you are taking auto-focus pictures and the subject you want to focus is not located in the center of the viewfinder, or if the

subject is difficult to focus in the situations mentioned below, use the focus lock.4www.butkus.org

1. First, aim the Focusing Frame at your subject and focus. If the Shutter Release is depressed halfway, the lens will start

focusing itself. As soon as it is focused on the subject, the green LED will turn on to tell you that focusing has been completed.

In the following cases, the auto-focus system will not function properly and the "Focusing Impossible" mark "=" will blink in the

viewfinder. In such cases, focus the lens on another object located nearly the same distance as the subject, activate the focus lock

and shoot. You can also focus the lens manually.

(1) When the subject is too bright or too dark;

(2) When the subject contrast is extremely low;

(3) When there is a strong light source in or around the Focusing Frame;

(4) When there are two or more subjects at extremely different distances in the Focusing Frame;

(5) When the subject has a uniform pattern such as vertical stripes

(6) Fast moving subjects;

(7) When the subject has no concrete form, such as flame or smoke;