Just bought a new lens - the Canon 70 to 200 L F4. Absolutely delighted with it and yesterday I carried out a test to establish how the lens performed under different aperture and shutter speed settings. The lens isn't amazingly fast being f4 only, but it is a constant f4 throughout the zoom range and its image is razor sharp.The test settings used were a constant focal length of 200mm and wide open at f4. As I was shooting in daylight the only way to avoid over exposure was to increase the shutter speed to 1/400s. This is not ideal and I have ordered some cheap ND filters to help bring the useable shutter speed down to 1/50s (for 25p) but these haven't arrived yet. Any way, I then lowered the aperture down to f5.6, f8, f11, f13 and f16, changing the shutter speed to compensate. Interestingly, the "proper" shutter speed of 1/50s could only be obtained with an aperture of f13.
Video here....
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