ABSTRACT
In an optically compensated zoom lens, all of the moving lens groups, move in unison, as if they were linked together on a common shaft. This is shown in Figure 34.1. It has the distinct advantage that no cam is required. However, such systems are generally longer than a comperable mechanically compensated system. Most important, the image plane moves slightly with zoom. An object of the designer is to make this movement less than the depth of focus. Optically compensated zoom lenses. https://s3-euw1-ap-pe-df-pch-content-public-p.s3.eu-west-1.amazonaws.com/9781315222295/bd2ad0d9-a48e-40ac-8986-c51474069cbd/content/fig34_1.tif"/>
