Sigma 50/50e manual Focus Mode Switch

macro and telephoto use. You can cancel the Self Timer during this 2 or 10 second wait, before the shutter fires by pressing the Self Timer button again.

The RC-1 IR remote control is relatively inexpensive and works very well for numerous situations. You can use it instead of the Self Timer when you want to be in the picture, or when you want to trip the shutter without touching the camera that would cause vibration. It also has a three position switch, off, on and 2 second delay. The 2 second delay position is for when you are in the picture and want to hide the remote before the exposure.

2.6 Focus Mode Switch

On the other side of the prism/flash hump you'll find the Focus mode switch and the Film Advance switch. The Focus mode switch is on top and has three positions and of course, only works when the lens is set to AF mode itself. In One Shot mode, as soon as you press the shutter button half way down, the camera will autofocus and lock onto on a subject and it stays locked at this distance as long as you continue hold the shutter button half way down. In this mode the focus has to lock onto some distance before the shutter will fire. This can prevent out of focus pictures as long as the subject doesn't move towards or away from the camera.

Figure 3: Focus Mode Switch

In AI Servo mode the camera will focus on the subject but will not lock anything.

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