Click on all use and press the shutter button. I understand exactly what it is manifesting In the implementation behind the autofocus work, why does not work in many cases.
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Active focus focus concentration of passive focus of autofocus photography photography photography
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<strong> How does autofocus work? </ strong>
Click on all use and press the shutter button. Virtually all modern cameras include a type of autofocus system. Thanks to the autofocus system, we can easily enjoy the photo experience, constitute the right picture, rather than setting the focus manually, a moment
However, autofocus has its limit. For example, sometimes you may want to make a slightly ambiguous picture as an artistic expression. Also, there is a limit to the auto focus implementation, which may fail in some scenarios. For example, the blue sky of photos to high-end SLR camera and passive autofocus system. In most cases, the camera moves the motor back and forth, and ultimately can not give up and focus.
It is a high work to help understanding with the automatic focus system for. It can be mounted and divided until the change, making it all divisions, without sustainable. Most small cameras use cheaper passive methods while the upper specialist camera uses both active or combination.
<strong> Passive auto focus: </ strong>
Passive auto focus can be perceived as imitating how we focused manually. The camera defines one or more areas in the image (usually they are marked as rectangles on the viewfinder or LCD). The camera analyzes the images seen through those areas and calculates the number of levels of focus. After that, the camera attempts to move the lens back and forth when recalculating the focus level. The camera looks for the position with the highest focus level. If the focus level exceeds a predefined threshold, the camera defines this area of the photo as focusing.
Focus level can be calculated in various ways. The common attribute of all calculations understands how much contrast the picture has. Although not in the scope of this article, one way to calculate such numbers is to run the photos through a high frequency filter - this is a high contrast
<strong> Active autofocus: </ strong>
Measure the distance with the work by activity is the photograph of the camera, object. Technically you can set the lens to the correct focus position if you knew the exact distance to the object you are taking a picture The active focus system is the object in the center of the image, Normally you shoot a beam of infrared light, invisible light, and the focus is set based on that distance up to that object.
<strong> Compound autofocus: </ strong>
An upper limit camera combines both systems. The camera chooses the right system for a particular scenario or crosses the inspection and uses both at the same time. Even a photographer does not decide it, it's all two options. For example, measure the distance to the system by using it with the blue sky camera at the time of shooting. The distance from the camera can be set with infinite camera, rib for movement in the page. In other cases, if the distance is not infinite, the camera uses the active system to place the lens in a nearly correct position and fine tuning the passive system In a dark scenario the camera does not work passive, so the active system You can choose to use.
<strong> Why Auto Focus does not work all the time? </ strong>
There is always a scenario where all the electronics and computing power of the camera and the auto focus of the camera fail. Failure is that the camera can not focus and the image is blurred or sometimes the image is actually focused but the camera does not "think"
What is the cause of such a case? The list is long, but here are some examples:
- Take a picture of low light: In order for the passive autofocus system to work, this can not be "see" the image in a low light scenario. Blinking of some system series We also failed this solution to overcome this limitation. An active system can measure the distance to an object in such a scenario, but if the object is not at the center of the image,
- The failure of the system is that the object is using an absorbing infrared beam. Some materials absorb infrared beams and cause the active - system to measure the wrong spacing. Although some scenarios and other infrared sources such as candle open fire fire, the active system that can render is absolutely not wasted.
- Low control purpose such as white walls or blue sky. Passive autofocus depends on the fact that the level of focus varies considerably when moving the lens back and forth. This ensures that the camera resolves at the right focal position. The level of low contrast things will not change how much it fails in a passive system.
Knowing how the autofocus system works sometimes why the camera can not concentrate camera maker sometimes, shoot and use manual focus. In other cases, you are focusing on another object in the image that is at the same distance, but is easy to focus on and focuses on that object
How your digital turtle
When you take pictures with your digital camera, you need to save them somewhere. Because the memory card of Kiku is about, certainly the actual number and other options.
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Image, Computer, cd, Store, Photograph, Memory, Photo, Image, Digital, Memory - Card, Photo Album, Card, Album, Location, Camera, Share, Picture, Computer Collision Picture,
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When you take pictures with your digital camera, you need to save them somewhere. Because the memory card of Kiku is about, certainly the actual number and other options.
1. Transfer the image to the computer. Connecting to the camera and the camera and distributing the instruction booklet of the download program to the CD - computer with the camera connected to the wire. Transfer images fast and easy. If not, you can delete that computer and start taking a memory card from the picture is a picture.
2. Burn your image on the CD. Also, keep CD-burner on commentable optical disc or share with others. When you become a picture, you often use a CD that you can not burn. This preserves the heartache of losing valuable pictures. Please label the CD and keep it in a location that you can easily obtain when you need to see your photo.
3. Save the image on the public web site. Some charge for internet service, many are completely free. You can choose to protect your image with a password or share it with the world. This picture Your photo is safe.
4. Print your image and place it in a photo album. Many people still prefer turning pages of photo albums and reviewing their memory. I can not even look at the computer.
5. Create a photo gift. Take your digital picture and there are places of shirt, mouse pad, cup, calendar and numerous other items. These will make great gifts and provide a way to keep the images always kept at hand.
These are just a few proposals. Using your creativity, you will come up with more ideas.
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