In theory, the 18-135mm should be a useful lens on the C100. Before I invested a lot of effort into a test shoot, I did the usual tests in the back garden and found an issue with its 'Fly By Wire' design which has made me rethink this lens. Check out the zooms - note both the iris and the focus tweaks. These are done by the lens, automatically.

To put this in perspective, I did the same with my stalwart Canon 24-105. It has its own issues (despite its name and rating, it sure ain't f4 throughout the zoom range).

The 24-105 is, to my mind and application, the better lens. The 18-135 is cheap, and a useful range, but not exactly stunning. I'll keep it, but it didn't live up to my aspirations.

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