Despite its length and weight, the review lens was relatively easy to mount on the EOS 5D body and surprisingly comfortable to use for hand-held shooting. This balance was retained when the camera and lens were tripod-mounted. It also handled reasonably well on the EOS 40D but was too heavy and out-of-balance on the much lighter EOS 1000D and 400D models.
The tripod mounting was easy to attach to a quick-release plate and provided excellent balance with the heavier cameras. A locking wheel on the left side allows the position of the camera-plus-lens to be adjusted along the vertical axis.
The HSM drive was quiet and autofocusing was generally fast and accurate under most shooting conditions. Both the focusing and zoom rings moved smoothly and positively, the former providing slightly more resistance than the latter.
Moving from the 150mm to the 500mm focal length requires a roughly one third of a turn and extends the lens barrel by 6.5 cm. Setting intermediate focal lengths was easy, thanks to legible markings and adequate spaces between them. In our tests, the marked positions were almost always in line with the focal length settings.
The focusing ring moves through roughly half a turn as you go from the closest focus to infinity. AF noise was relatively low, thanks to the HSM drive. We observed little tendency to 'hunt' with low-contrast subjects, except in dim lighting. Backlit subjects were handled with ease.
Margaret Brown
more : photoreview
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