Pressing the INFO button with no reviewed image displays an overview of the current camera configuration, note that the EOS 40D provides two different info displays; Normal display and Shooting function display.
Shooting function display
Record review & play displays
By default the EOS 40D provides a two second review display immediately after the shot is taken, this can be disabled or extended to 4 or 8 seconds or as long as you hold the shutter release button. During record review you can press the erase button to cancel / erase the currrent image. Record review and play share the same display modes, just press the INFO button to select between the four available modes (see below).
There are four display modes available in record review / play, you can also optionally enable 'Highlight alert' (blinking highlights) and / or 'AF point display' (the last two in the table below).
1: Large image + status line (shutter speed, aperture, comp, filename, card)
2: Large image + status line + image size & quality + image number
3: Small image + status line + lum histogram + detailed shooting info
4: Small image + status line + lum histogram + RGB histogram + detailed shooting info
Optional 'Highlight alert' enabled
Optional 'AF point display' enabled
The EOS 40D has dedicated magnify buttons and provides fifteen steps of magnification, the final step appears to go beyond the detail of the cached image and can look pixelated.
Play thumbnail index
Unlike the EOS 30D the 40D provides two levels of thumbnail index, the initial view being a four image 2x2 index, press the thumbnail button once more to switch to a nine image 3x3 index. You can use the multi-controller or quick comman dial to move around images or the main dial to jump images (ideal if you have the 'screen' jump mode selected).
Other Play displays
After pressing the erase button you are shown a Cancel / Erase option
An example of the menu shown when the camera is connected to a Direct Print compatible printer