Procedure, Mounting the camera in the housing

thoroughly toweled dry before opening up. After removing the lid and servicing the camera, replace the lid straight away, rather than leaving it lying around. Before replacing the lid, make sure that no contamination such as dust, hair, salt, sand etc. has fallen onto the O-ring or O-ring recess, as a precaution we recommend to inspect the O-ring every time the lid is opened and to carry out the maintenance if necessary.

Procedure:

•Place the lid on a firm non-slip level surface.

•The O-ring can be extracted using an O-ring extractor tool (make sure the tool as no sharp edges). Alternatively use the flats of the thumbs to gently stretch the O-ring on two faces (Fig. 4) thus making a small loop protruding a few mm. The loop can then be grasped between finger and thumb, to pull the O-ring over the lip.

•Clean the O-ring recess (the square groove where the O-ring sits) with a cotton bud.

•Inspect the O-ring all the way round its surface for damage such as cuts tears or contamination. This should be done visually and also by feeling the surface texture between finger and thumb.

•IF THE O-RING IS DAMAGED OR SUSPECTED OF BEING DAMAGED, DISCARD IT IMMEDIATELY. A spare O -ring is supplied with your housing, or a replacement O-ring can be obtained from 10 BAR. If the O-ring is contaminated or suspected of being contaminated, clean it with a cotton cloth that is free of all chemicals or contamination. After cleaning inspect the O-ring again.

•Once the O-ring has been inspected and verified fit for use, apply a SMALL amount of Silicone grease to the O-ring. The silicone grease must be evenly distributed round the O-ring

•Replace the O-ring into the groove; run a finger round the O-ring, to make sure it is snugly seated in the groove.

(Fig. 4) Stretch the O-ring

4.7Mounting the camera in the housing:

Remove the lens cap and wrist strap. The pressure release plug should be pulled out before inserting the camera. Attach the plastic slide tray to the camera’s tripod mounting fixture with a coin, screwdriver or the end of the universal tool supplied (Fig. 5). Take care not to excessively tighten the screw. Slide the camera into the body along the guide rail (Fig. 6). Make sure the camera body reach the limit and test the function of the on/of button on the body of the housing. Slide the hot shoe plug into the hot shoe (Fig. 7) Note: If you find that the buttons do not align properly with the controls, please check again that the camera is properly seated to the limit of the guide rail.

(Fig. 5)

(Fig. 6)

400D 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.