From NaturePixels.org
June 2008
Author & Editor
Author: Jz
Editor: <Please add your name here if you have edit this article>
Photographs and article are copyright of Jz
Just a simple test to compare the sharpness and the functionality of the IS
Another test to show the sharpness after adding a 2x TC
Equipment and settings
1dmk2N , EF300 F2.8L IS , EF300 F2.8L Non IS , kenko2x
both camera body and lens rested firmly on flat surface with another weight put on top to minimise shake
F2.8 - 1/160, iso200
F5.6 - 1/40, iso200
F8 - 1/20, iso200
raw files convert to jpg without any alteration, 100% cropped slightly off center
observations
1.sharpness seems to be best when IS is turned on
2.without IS both lenses are comparable in sharpness
3.with a 2x TC, sharpness falls a little but is still comparable
slow shutter was used deliberately to see if it makes any difference
results seems to show there will still be some shake no matter how good you stabilise your setup(i am also puzzled)
so IS is a good function to have when you are out in the field
notes
same lenses differ in quality so mine might not perform the same as yours
this test might not be 100% accurate so do not flame me if you find it untrue in any way
Photographs and article are copyright of Jz
