Sigma 18-200mm Build and Handling
This lens is surprisingly solid in its construction and is heavier again by half than its non-OS sibling. The difference is not just from the OS system though, with a better overall feel to it that encourages confidence in its abilities. Not that the lens is heavy, but it is certainly no plastic fantastic!
Two substantial, rubber embossed rings, one to operate the zoom and the other for manual focussing adorn the majority of the barrel. Both are nicely torqued with the focussing ring being the lighter of the two to use when in manual mode. Two control switches adorn the left of the barrel (Canon and Sigma fit) one for the AF on/off and the other for the OS on/off. Both are sturdy and have well protected collars. A smaller zoom lock switch also sits just to the left of centre. The zoom action extends the barrel by some 60mm on a double trombone that has virtually no play in it. The first of the trombone sections is helpfully marked with a reproduction ratio that goes to a maximum of 1:3.9.
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