One of the common problem with the Canon 7D, 60D and 1DMk4â€¦ is that the first couple of photographs are fuzzy, and all the other photos after that are sharp and crisp.
The 2 major causes are:
- The IS/VR, in the Canon lingo: Image Stabilization, in the Nikon lingo: Vibration Reduction in the Nikon world
- The focus
Image Stabilization/Vibration Reduction
In Canon and Nikon cameras, the image stabilization (VR in Nikon) is in the lens. The other camera manufacturers followed Olympus' lead when it created the image stabilization directly in the camera body.
The image stabilization/vibration reduction uses some motion sensors and 1 or 2 micro-gyroscopes to shift, either some element of the lens, or the CMOS/CCD sensor. Basically, it introduces another movement to counter-act your movement. You can see it in action if you mount a â€œnot a new generationâ€ IS/VR lens on a tripod with mode 1 enabled with the head slightly loose, then the camera will start to drift.
It takes half a second for the Image Stabilization/Vibration Reduction to kick in. This means that the IS/VR engages half a second after the focus has been engaged. The IS/VR has started, but it hasn't achieved stabilization yet. It can take between another Â½ sec to another full second to achieve stabilization. With the new Canon L lenses and the new Nikon VRII lenses, when the IS/VR has been achieved after another second, the IS/VR reaches the Lotus position and achieves â€œnirvanaâ€ to give the full 4 or 5 f/stop of improvement.
2 photos taken 0.125 sec apart with Image Stabilization on for both photos
This is the equivalent of using a tripod.