Focus preset. Allows you to preset a particular distance and return to it in .NET

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Focus preset. Allows you to preset a particular distance and return to it
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instantly. For example, if you re covering a baseball game and your main shot is the pitcher, you could preset that focus to immediately return to it if you refocus on something else.
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Set. Allows you to lock in the Focus preset by pressing the Set button. Instantly
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recall that focus by turning the serrated ring located just in front of the manual focus barrel.
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AF Stop button Serrated ring
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AF Stop button
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100 Part II System Components
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AF Stop buttons. The four buttons located around the front black ring of the
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lens are the AF Stop buttons. They were originally designed to stop AF focus and instantly lock the focus as if you were in One-shot mode. If someone stops, or the lens is being fooled by people running past in the foreground, you can tell the lens to stop searching. The buttons are placed where your left hand will naturally be, in various positions (or right hand if you re a lefty). And with the addition of the EOS-1D and 1Ds Mark III series, you can choose what the buttons can do for you with a select group of Image Stabilizer super-telephotos, including the 200mm f/2.0L. These choices can all be found in Custom Function menu III-6, as follows:
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C.Fn.III-6-0. Lens AF Stop Button Function. This is the default and traditional
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setting. Autofocus is suspended when the button is pressed, and resumes when the button is released.
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C.Fn.III-6-1. AF Start. AF operates only when the button is pressed. C.Fn.III-6-2. AE Lock. If the AF stop button is pressed while exposure metering
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is active, AE lock takes e ect in AE. As a result, the button helps to control exposure.
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C.Fn.III-6-3. AF Point. If the camera is set for manual focus point selection,
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pressing one of the Stop buttons instantly switches it to autofocus point selection.
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C.Fn.III-6-4. One Shot: AI Servo If the camera is set for one-shot AF, pressing
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one of the buttons temporarily switches it to AI Servo AF mode.
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C.Fn.III-6-5. IS Start. If IS is on, the lens image stabilizer only operates when
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one of the Set buttons is pressed.
C.Fn.III-6-6. Switch to Registered AF Point. In this nal selection, pressing
one of the Set buttons selects a previously registered focusing point.
Specialty Lenses and Accessories
These accessories allow you to get closer to the subject, either by increasing the focal length or extending minimum focus. Thus you can have any one lens act as three: in its normal mode, as a closer macro type lens using extension tubes, and as a longer lens than it normally is by using and EF extender.
EF extenders
Placed on the rear of the lens, extenders increase the focal length at the loss of exposure. Optical quality of the current extenders is very good. Canon manufactures two extenders: the EF 1.4x II Extender and the 2x II Extender. As the name implies, the 1.4x Extender magni es the focal length 1.4 times at the expense of one stop exposure. Thus, the 200mm f/2.0 lens becomes a 280mm f/2.8 lens. The EF 2x II Extender doubles the focal length, but at the loss of two stops.
5 Making Smart Lens Choices
The extenders are designed to work with a speci c group of lenses only. These include any xed focal length lens over 135mm (other than the 135mm soft focus lens), as well as the 70-200mm L series of lenses, and the 100-400mm IS zoom lens.
Macro lenses
Canon manufactures four macro lenses: the 50mm f/2.5 Compact Macro, the 100mm f/2.8 USM Macro, the 180mm f/3.5L Macro USM, and the Macro Photo MP-E 65mm f/2.8 1-5x Manual Focus lens. Tamron and Sigma also manufacture macro lenses for the Canon EOS system. I carry the 50mm Compact Macro with me; it s an inexpensive and decent-quality lens, though watch out for are, particularly in backlit situations. For the occasional macro shot, it works well for me.
Extension tubes
Extension tubes allow you to focus closer than minimal focus allows, and are often used for macro photography as well as tight portraits. Canon makes two extension tubes: the Canon Extension Tube EF 25 II, and the Canon Extension Tube 12 II. The 12 II is the more useful for me, while the 25 II focuses closer. Kenko also manufactures extension tubes for Canon and is less expensive. No optics are used in extension tubes all they do is lengthen the distance from the back of the lens to the sensor. No exposure compensation is necessary as it is automatically read by the camera s metering system.
The 25 II is recommended for focal lengths of 50mm and longer. The 12 II is compatible will all lenses except the 15mm sheye, the 14mm f/2.8L, and the MP-65mm f/2.8 macro lens (a manual focus macro lens that can ll a 35mm frame with a grain of rice). If you need it, there it is.
5.22 Happy child. ISO 640, 35mm f/1.4L, 1/30 second at f/1.4.