ISO settings in digital camera technology Replica nominal speeds of the films of yesteryear. In very general terms, the ISO is the sensitivity to light of the sensor in the same way that film speeds were more or less sensitive to light. But there are differences between film and digital sensors; specifically, the sensitivity increases in a digital camera, the sensor output is also amplified. This was referred to as grain when using high speed film. Therefore, although you have the option of increasing the ISO sensitivity at any point, the counterpart in greater amplification or accumulation of an excessive burden in pixels is an increase in digital noise. And the result of digital noise is a total loss of resolution and image quality.
in part because the 5 d Mark II has relatively large sensor pixels and because Canon has done a good job of applying advanced interna-reduccion of noise processing, the 5 D Mark II stands out as the top performer even with high sensitivity settings, particularly in times of exposure of 30 seconds or less.
in this intelligent mode of point and shoot, Auto ISO controls the sensitivity of your sensor according to the shooting mode. In Full creative Auto, P, Tv or Av, the camera selects a range ISO 100-3200. Change to M, B, or add a Speedlite and Auto ISO is at 400. Auto ISO is shown as an A on the LCD panel and is located at the bottom of the scale by turning the main dial to the left after pressing the ISO button.
range ISO and options of the custom function
the 5 d Mark II offers a wide range ISO, including Auto and settings of 100 to 6400 in 1/3-stop increments or 1/2-stop increments, established through the options of C.Fn I-01. The ISO range can expand to include ISO 50 (shown as L), 12800 (shown as H1) and an unbelievable 25600 (shown as H2) by setting C.Fn I – 03 on. Note that ISO 50 reduces the dynamic range in the highlights by approximately 1 stop, which makes this less useful sensitivity in high contrast light. ISO 50 can be useful in a Studio environment providing flexibility in the choice of opening.
with the 5 d Mark II, Canon offers an option to reduce or eliminate noise in long exposures.
using the noise reduction for long exposures, available using C.Fn II-01, noise is virtually eliminated by treatment in the camera which is very capable but takes almost as much as the exposure to complete or total.
the ISO setting and extended range ISO
to change the ISO setting on the 5 d Mark II, follow these steps:
1. Press the ISO button on the LCD panel. The current ISO setting is displayed on the LCD panel and the viewfinder.
2. Turn Quick Control dial to set a greater sensitivity to the right or to the left to set a lower sensitivity. The camera displays ISO settings as you turn the dial. If you have extension ISO activated using C.Fn II-01, appears the ISO 50 l, ISO 12800 is shown as H1 25600 shown as H2. The choice of ISO that you select remains in effect until you change it again.
to activate the ISO extension, follow these steps:
1. Press the Menu button and then tilt the multi-controller until you see the menu of custom function (orange).
2. Press the set button. The custom function screen appears and the number control function in the upper right corner of the screen is activated.
3. Quick Control dial turn to adjust the C.Fn I number 03 and then press the set button. The expansion of ISO control is activated.
4. Turn the dial fast to select option 1: to and then press the set button. Expansion of the ISO will remain lit until you change it.