Function Controls 350D, Set up Instructions Air Lock

3. Function Controls 350D

1.	Mode Dial, Power	6.	ISO / AF, Metering Mode	11. Jump
2. Bulkhead		7. WB, Set		12. Play, Delete
3.	Main Dial	8.	Illumination	13. Zoom Dial
4.	Shutter	9.	Exposure Compensation /
		Aperture, Drive Mode
5.	AE/AF Lock, AF Point	10. Menu, INFO

4.Set up Instructions

4.1 Air Lock:

The body and lid are designed with the Air Lock system “no clip” closure arrangement. Testing has shown that this arrangement allow the water to exert an even pressure on the O- ring, increasing the reliability of the watertight seal.

4.2 Pressure release plug

To open the housing, the pressure release plug must be first unscrewed and then pulled out all the way (Fig 1). This provides a passage for the air to pass though and eliminate the pressure different between the inside of the housing and the ambient.

The plug consists of an internal double O-ring seal on the stainless steel slide shaft. These internal O-rings form the watertight seal. There is also a large outer O -ring under the knob. This O-ring serves to prevent contamination of the slide shaft, with dirt, salt etc., and is not required for watertight integrity. If this O-ring should become detached, it can simply be pushed back in place.

8/6/2006

350D specifications

The Canon EOS 350D, 300D, and 400D are pivotal models in the history of Canon's digital SLRs, each contributing significantly to the popularization of DSLR technology among enthusiasts and professionals.

The Canon EOS 300D, introduced in 2003, marked a turning point for digital photography. It was Canon's first entry-level DSLR and brought professional-quality features to a wider audience. It features an 18-megapixel APS-C sensor, capturing images at a maximum resolution of 3072 x 2048 pixels. One of its defining characteristics was the inclusion of an 8-megapixel sensor, which was revolutionary at the time, allowing photographers to produce detailed images. The camera also provided a robust build and a user-friendly interface, making it accessible to beginners.

In 2005, Canon released the EOS 350D, building upon the 300D's foundation. The 350D refined the design with a smaller and lighter body, while also bumping up the resolution to 8 megapixels. It introduced a 2-inch LCD screen with a sharper display, enhancing usability. The camera also incorporated a more advanced DIGIC II image processor, improving overall performance, including faster autofocus and better noise control at higher ISO settings. The 350D supported a range of lenses, further expanding creative possibilities for users.

The Canon EOS 400D, launched in 2006, pushed the envelope further. With a resolution of 10 megapixels, it offered even more detail in images. The 400D introduced a newly designed dust reduction system, effectively combating sensor dust—a common issue for DSLRs. The 2.5-inch LCD screen was larger and featured a better viewing angle, allowing for more comfortable composing and reviewing of shots. This model was also equipped with the DIGIC III processor, which improved shooting speed and image quality, particularly in challenging lighting conditions.

All three models share a commitment to durability, usability, and performance, making them ideal choices for budding photographers. Their compatibility with Canon's extensive EF lens lineup ensures that users have access to a broad range of focal lengths and creative options.

In summary, the Canon EOS 300D, 350D, and 400D each played a significant role in the evolution of digital photography, providing key technologies and features that appeal to both novice and seasoned photographers alike. Their legacy continues to influence Canon's current offerings in the DSLR market.