R is for... Raw image quality

Your EOS camera offers a wide range of image quality options, but to get the best results you should always shoot uncompressed 'Raw' files, as these captures the maximum amount of tonal information, from bright highlights through to shadows, for optimum image quality. Raw images also give you greater flexibility when editing your images, and enable you to recover detail that would be lost if you shot JPEGS- they're almost always worth the extra space they take up on memory cards. The EOS 1D Mk III camera saw the introduction of the small Raw (S-Raw) file format, which shoots slightly fewer high-resolution images, thus saving space on memory cards and computers. Like full-sized Raw images, S-Raw images can be processed using Canon's DPP or programs such as Lightroom.

Image Quality

You can check that your Canon DSLR is set up to capture Raw or JPEG images via the Image Quality option in the shooting menu.



The Canon radio wireless flash system gives you extensive control over remote Speedlites, either via the camera menu or from a Speedlite ST-E3-RT transmitter, or the Speedlite 600EX-RT and new 430EX III-RT flashguns. However, it's worth noting that one setting that cannot be changed remotely is the zoom setting of remote Speedlites. To avoid any problems, be sure to set the zoom head to your desired setting before you place any Speedlite unit in its remote position; if you don't, the unit will use the default remote flash head setting of 24mm, which might be too wide for your needs.


The EOS Remote app is an Android and iOS application that enables a smartphone or tablet to connect wirelessly to an EOS camera with built-in Wi-Fi. The app can currently be used with the EOS 6D and 70D, and performs two main functions:

1. It enables you to view images stored on your camera, and download them to
your smartphone or tablet - this enables you to check for focus and exposure on a larger screen than the one on the camera. You can also assign ratings to images, or delete them if you don't want to keep them on the card. You can also view an image's basic EXIF data-including the shutter speed, aperture, and ISO- and you can share images via email.

2. It enables you to remotely control your camera directly from your smartphone or tablet. If you have access to a Wi-Fi network you can use infrastructure mode, where both the smartphone and camera are on the same network. If there's no network connection, the smartphone and camera can be connected via an AdHoc mode-essentially the phone and camera generate their own Wi-Fi network.


On some EOS models, you can rate your images in-camera, using a Rate button to the left of the rear LCD screen. This enables you to rate images from 1-5 stars, and stores the rating in the EXIF data to help you to sort your pictures later.