The EOS-1N's Exposure Modes A-TTL Flash AE mode A-TTL, the standard flash exposure mode for EOS flash photography, stands for "Advanced Through-the-Lens" exposure control. That its "through-the-lens" means that the light value of the flash illumination actually reaching the film through the lens is what determines the exposure. For this purpose, the EOS-1N contains a dedicated three-zone sensor aimed at the film plane, to control the flash exposure while taking the subject's position into consideration. HK actors shot using A-TTL Program Flash AE   The term "advanced" refers to a unique pre-exposure flash burst emitted automatically to measure the flash-to-subject distance. In the Intelligent Program AE mode, the EOS-1N's built-in microprocessor compares the aperture value required for correct background exposure based on the A-TTL program, to an aperture value based on flash-to-subject distance as revealed by the A-TTL preflash. By choosing the smaller aperture of the two, the system provides correct exposure up to the conditions, plus more depth-of-field for close-ups. Canon Speedlites like the discontinued 420EZ and 430EZ as well as the 540EZ can be used to provide A-TTL Flash AE in the EOS-1N's Program AE mode. Flash photography in Manual Exposure mode   In certain situations, using Program A-TTL flash may not be suitable. In this case, the user can always switch to the TTL Flash exposure in either one of these three modes, Shutter-priority AE, Aperture-priority AE or Manual Exposure with the Speedlite 540EZ. Shutter-priority AE (Tv) The EOS-1N's LCD panel on Tv mode   In this mode, you use the Main Dial to select your desired shutter speed, with the camera then determining the best aperture. Speeds can be set in 1/3-stop increments from 30 seconds to 1/8000 second but using Custom Function (CF 6) will change the increments to half-stop or 1-stop settings. Naturally, the faster speeds are effective for freezing fast action and slower ones to have some blur and show the subject's motion to emphasize movement. Or you can use this mode for most of your shooting requirements, especially if controlling the shutter speed to be used is of primary importance. Below are examples of photos that were shot using the Tv mode of the Canon EOS-1N. Yellow cabs outside Manhattan's GPO building Inside the Manhattan Shopping Mall Facade of a church in Manhattan Italian 250cc ace Valentino Rossi Kiwi 500cc rider Simon Crafar Spaniard 500cc rider Sete Gibernau 5-time 500cc world champion Mick Doohan   Aperture-priority AE (Av) Again, the Main Dial is used to control the setting, this time the aperture and the camera decides the appropriate shutter speed for correct exposure. Aperture-priority AE lets you control the depth-of-field: large types for out-of-focus backgrounds and small ones for deep zone of focus. The values are normally set in 1/3-stop increments (as in Tv mode, CF 6 will change the increments). The EOS-1N's LCD panel in Av mode Deep focus zone for landscape Large aperture for shallow depth Smaller aperture for deeper depth These selected photos below were shot using the Av mode even though they are part of my New York City batch that were mainly photographed with the EOS-1N's Intelligent Program AE. This was shot at f/11 And f/8 for this one The shadows area was tricky, shot at f/5.6 This was shot at f/5.6, speed was 1/8 sec. For the last photo (above, right), I don't know exactly how it turned out to be like this, with movements all over, including the ceiling and lights except for the four portrait sketches near the top, that are all sharp. << Back to Main . 1 . 2 . 3 . 4 . 5 . 6 .