When Autofocus Fails

Autofocus can fail to achieve focus (the focus confirmation light <o> blinks) with certain subjects such as the following:

Subjects difficult to focus

Low-contrast subjects

Example: Blue sky, solid-color walls, etc. Subjects in low light

Extremely backlit or reflective subjects Example: Car with a reflective body, etc.

When both near and far subjects are covering the AF points Example: Animal in a cage, etc.

Repetitive patterns

Example: Skyscraper windows, computer keyboards, etc.

In such cases, do one of the following:

(1)With One-Shot AF, focus an object at the same distance as the subject and lock the focus before recomposing. (p.46)

(2)Set the lens focus mode switch to <MF> and focus manually.

If an Extender (sold separately) is attached and the maximum aperture of the lens is f/5.6 or smaller (larger f/number), AF will not be possible (except Live mode AF). For details, see the Extender’s instruction manual.

For the cases AF can fail to achieve focus with Live mode AF, see page 106.

162

Page 161 Page 163
Page 162
Image 162
Canon EOS 450D instruction manual When Autofocus Fails, Subjects difficult to focus, 162
Page 161 Page 163

EOS 450D specifications

The Canon EOS 450D, also known as the Rebel XSi in North America, is a DSLR that made its debut in early 2008. Positioned as an entry-level digital SLR, the EOS 450D was designed to cater to both photography enthusiasts and beginners looking to elevate their skills.

One of the standout features of the Canon EOS 450D is its 12.2-megapixel APS-C-sized CMOS sensor, which provides an impressive resolution for capturing high-quality images. This sensor allows photographers to print large formats and crop images significantly without losing detail. Coupled with Canon’s DIGIC III image processor, the camera delivers excellent performance in terms of image quality, noise reduction, and overall responsiveness.

The camera offers a robust ISO range of 100 to 1600, expandable to 3200, allowing for flexibility in various lighting conditions. Its nine autofocus points provide fast and accurate focusing, essential for capturing action shots and ensuring sharp images. The 450D also features a 3-inch LCD monitor, which is user-friendly and allows for easy navigation through menus and settings.

In terms of shooting capabilities, the EOS 450D supports continuous shooting at around 3.5 frames per second, making it suitable for capturing dynamic scenes. Additionally, the camera includes a variety of picture styles, enabling users to customize their images based on the desired effect.

For those interested in advanced photography techniques, the EOS 450D includes a range of exposure modes, including manual, aperture priority, shutter priority, and program mode. The camera also features built-in digital photo features such as automatic exposure compensation, which helps in achieving optimal results.

The build quality of the 450D is commendable for its class, featuring a comfortable grip and lightweight polycarbonate body, which enhances portability. Moreover, the camera supports a wide range of interchangeable lenses, allowing users to explore different photography styles and subjects.

Overall, the Canon EOS 450D stands out for its combination of user-friendly features, image quality, and solid performance. It remains a popular choice for amateur photographers looking to grow their skills and experience the world of DSLR photography. With its blend of technology and practicality, the EOS 450D has cemented its place in the hearts of many photography enthusiasts.
Top Page Image Contents