The technology of ISO settings on digital cameras rated speeds replica films of yesteryear. In very general terms, the ISO is the light sensitivity of the sensor in the same way that the velocities of the film were more or less sensitive to light. But there are differences between film and digital sensors, specifically as increases the sensitivity setting on a digital camera, the sensor output is also amplified. This is known as grain when using high speed films. So while you may opt to increase the ISO sensitivity at any point shot, the balance in the amplification or increased accumulation of an excessive burden on the pixels is an increase in digital noise. And the result of digital noise is a total loss of resolution and picture quality.
| Canon EOS 5D Mark II 21.1MP Full Frame CMOS Digital SLR Camera with EF 24-105mm f/4 L IS USM Lens |
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In part because of the 5D Mark II has relatively large pixels on the sensor, and the fact that Canon has done a good job of applying advanced processing internal noise reduction 5D Mark II stands out as the best performer, even in settings with high sensitivity, particularly in the exposure time of 30 seconds or less.
In this intelligently taken from point-and-shoot, automatically controls the ISO sensitivity of your sensor, depending on the mode of filming that ‘re in whole or Creative Auto, P, Tv, or Av, the camera selects between 100 — ISO 3200 range. Switch to M, B, or add a Speedlite, and Auto ISO locks on to 400. Auto ISO is displayed as an A in the LCD panel when selected and is in the bottom of the scale by turning the main dial in the opposite direction after pressing the button for selecting the ISO.
ISO Range and the custom function options
The 5D Mark II offers a wide range of ISO sensitivities, including Auto and settings from 100 to 6400 in 1/3-stop increments or 1/2-stop increments, set using options in C. Fn I-01. The range of ISO can be expanded to include ISO 50 (shown as L), 12800 (shown as H1), and an incredible 25,600 (shown as H2) through the establishment of C. Fn I-03 to On. Note that ISO 50 reduces the dynamic range of highlights by about 1 stop, which makes this less useful sensitivity to light, high contrast. ISO 50 can be useful in a study of value, providing flexibility in the choice of opening.
With the 5D Mark II, Canon offers an option to reduce or eliminate noise in long exposures.
Using long exposure noise reduction option, available through C. Fn II-01, noise is all or virtually eliminated by the treatment in the chamber ‘s very capable, but is almost as long as full exposure.
Adjusting the ISO and ISO Extended Range
To change the ISO setting on the 5D Mark II, follow these steps:
1. Press the ISO selection button above the LCD panel. The current ISO setting is displayed on the LCD panel and viewfinder.
2. Turn the quick control dial clockwise to achieve greater sensitivity or left to set a lower sensitivity. The camera shows the ISO settings and turn the dial. If you have the ISO expansion enabled by the use of C. Fn II-01, then ISO 50 is shown as L, ISO 12,800 is shown as H1, and 25600 is shown as H2. The ISO option you select remains in effect until changed again.
To enable the expansion of ISO, follow these steps:
1. Press the Menu button and then the inclination of the multi-controller until the custom function (orange) menu appears.
2. Press the Set button. The Custom Function screen appears, and the number of custom function control in the upper right corner of the screen is selected.
3. Turn the Quick Control Dial for the C. Fn I number to 03 and then press the Set button. The ISO expansion control is activated.
4. Turn the quick control dial clockwise to select option 1: On and press the Set button. Expansion of ISO stays on until you change it.
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