|Sigma 18-200mm f/3.5-6.3 DC OS Specifications|
|Lens Construction (groups)||13|
|Lens Construction (elements)||18|
|No. of Diaphragm Blades||7|
|Closest Focusing Distance||0.45m (17.7")|
|Maximum Diameter x Length||79mm x 100mm (3.1" x 3.9")|
The 18-200mm F3.5-6.3 DC OS HSM is on the face of it an ideal 'do-it-all' travel lens; the 11x zoom range, image stabilization and useful close focus distance combine to give great operational flexibility. But of course this versatility comes at a cost, as optical compromises must necessarily be made to provide such a long range in a single lens.
Sigma must be congratulated for being the only independent to offer in-lens stabilisation and in this case, one that really works. It is not really required at the short end of the range but does become very handy as the focal length increases. With commendable optical performance for its type, the lens is well worth consideration.