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Canon EOS 50 D looks quite similar to its predecessor EOS 40 D, but there are significant improvements in the new innovation. With 15.1 megapixel CMOS sensor, latest DIGIC 4 imaging processor, much-improved 3 inch LCD with Live view mode, the camera promises impeccable photo quality. The EOS 50 D is a perfect camera for an amateur and a seasoned professional alike. The camera uses a Compact Flash card to store photos. Though, these cards store countless number of photos, they can render photos inaccessible due to various reasons like file system damage, interruption in read/write errors and virus attacks. Therefore, a user is recommended to keep backups in good shape so that he can compensate data loss when the need arises. If somehow a backup becomes corrupt or unavailable, a user can blindly trust a photo recovery software to recover lost photos.

As a practical case, a user may not be able to view saved photos owing to the following error when using a CF card that is greater than 32 MB with Canon EOS 50 D:

“CF card error”

The above error will render the previously saved photos inaccessible and a user will not be able to click and save new photos from his Canon EOS 50 D.

Cause

The error indicates that the CF card is either corrupt or not properly formatted for use in Canon EOS 50 D.

Resolution

There can be two ways to resolve the issue:

If a user is formatting a CF card greater than 32 MB in size in Windows, he should change the file system to FAT. A card formatted using this format works without error in Canon EOS 50 D
Alternatively, a user can reformat a CF card using his Canon EOS 50 D. For formatting, he should refer to the camera manual.

Since formatting erases all the photos stored on the CF card, it is suggested that a user should use a photo recovery software immediately. Any delay or use of the card before the retrieval can hamper the prospects of successful recovery. A third-party photo recovery utility can be easily downloaded from the Internet.

Stellar Phoenix Photo Recovery is an excellent software which recovers photos from multiple camera brands (Canon, Nikon, Sigma, Sony etc) in almost all data loss situations. The photo recovery software, which has a simple graphical user interface, recovers all photo formats including JPEG, RAW, Exif, Tif, PNG etc.

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http://EzineArticles.com/?expert=Shaun_Pattrik

The Canon EOS 50D Live View has three different Auto Focus mechanisms. And this is a greatly improve than over the Canon 40D. These three AF mode in Live View are the Quick mode, Live mode and the Face Detection mode. These modes can be accessed by pressing the AF button at the top where near the LCD on top of the EOS 50D camera while it is in Live View.

There are many ways to navigate Canon EOS 50D Live View auto focus menu. The primary selector is used to select which type of AF mode that you prefer. The secondary turning knob selector is used to choose the shooting mode, such as single shoot, multiple shoots, shoot with timer and etc. While the joystick is being used to control the focusing point out of the 9 focusing points. To perform focus locked, it is just as simple as clicking the AF-ON button.

Quick mode is similar to the traditional Live View auto focus. And it is best to perform photo taking when one need to hold the camera far away from body, for example over an obstacle object or shooting in the crowd. Once the composition is done, press on the AF-ON button to trigger the focusing. The 50D camera mirror will flip down and processing the auto focus lock. And the auto focus lock is indicated with the red square.

EOS 50D Live mode allows you to move the white focus square to your preferred focused portion. Again, press the AF-ON button to achieve the auto focus lock. This time, it will indicate with a green-color square. Live mode is very useful when composing your subjects in different place in the frame in real time.

Face Detection recognizes the facial structure and indicates them in white box. It works even moving the EOS 50D camera slowly. Pressing and holding the auto focus button will focus the camera on the location and will be indicated with green-color box when focus lock is achieved.

In addition from these focusing mode, there is a manual Live View focus which works best when shooting on a tripod. It is a shooting method that good to be used when shooting macro on a tripod. Before composing, switch the EOS 50D camera lens to Manual Focus. Move the white-color focus box over to the subject. Then, you can zoom into the subject by pressing the Zoom button to have a better view to perform focus manually. When the manual focusing is done, just take a shoot and you will be amazed with the picture quality by shooting using this manual Live View focus method.

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http://EzineArticles.com/?expert=Tim_Lawrie