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Image Stabilizer Tests
| EF 300mm f4L IS | EF 24-105mm f4L IS | Tamron 150-600mm |
These test were done to evaluate the effectiveness of the Image Stabilizer function handheld and with a monopod. All shots are at a fixed aperture, the shutter speed change is affected by varying the sensor speed from ISO 100 to 3200. Because it was necessary to keep the aperture constant to prevent variation of IQ due to f-stop the shutter speed may vary slightly between test cases due to natural light variations.
The target was a dual orthogonal ISO oversampled lens test sloping lines in the centre of the frame. A reference case is included on a tripod using mirror lockup, and for monopod and handheld a series is recorded for IS Off and IS On, where available IS Mode 1 and IS Mode 2 were tested.
For the Monopod and Handheld cases the AF was touched up after framing the shot to compensate for any small distance changes; this may mean there are small variations in the focus accuracy but these are insignificant compared to the camera shake.
The results are summered below normalized to the ideal shutter speed of 1/(focal_length X crop factor) in stops. So for a 100mm lens on a 20D the "safe" IS off speed is 1/160 which will be labeled 0 stops. +1 stops above this speed is 1/320 and 1 stop below (-1 stop) is 1/80.
Piecewise linear regression trends to the data are shown for clarity. It should be noted that the data has considerable variation at times so the results should be taken as approximate indications.
It is worth noting that the IS characteristic on the zoom lens is similar to that on the prime at the wide end only and quite different at the long end. It may be this indicates that the IS is optimized for the wide end in some way.
Details of the performance of the 300mm f4L IS with the EF 1.4X II and EF 2X II teleconvertors are available on the 300mm f4L IS page.