This is a basic review of the Sigma 18-200mm f 3.5/6.3 DC (IF) lens (Pentax mount)

Lens basics: 18-200mm (11.1x zoom range)
Note: This is not the 'OS' (Optical stabilized) version, as Pentax cameras have their own internal stabilizer 'function'.
Cost: $249 (Amazon) - OS version is ~$400.
Filters: 62mm

This lens is a relatively compact 'superzoom' for DSLR cameras, and light weight. This makes for a good replacement to the kit 18-55mm that comes with most entry level DSLR cameras, and a great all around lens for those coming from the point and shoot cameras that can have 10-36x zoom, and are not used to having an SLR with ~3x zoom lens. At 62mm, you'll want to purchase a relatively cheap ($7) lens filter to keep from having the lens getting scratched/dust/etc when outdoors.

Pros:
- Great amount of range for an SLR
- (relatively) light weight for this range
- 62mm filters are relatively easy to find
- Bargain price
- Fairly sharp at at ranges
- Excellent for an outdoor, all around lens

Cons:
- Not the 'fastest' lens - I wouldn't recommend this for dark/distance. Make sure your camera can handle high ISO, or you have a tripod for night shots/indoor
- Some CA in high contrast shots outdoors
- Lens zoom creep if you're not holding it (there is a lock for this)
- AF in low light will 'hunt' - recommended using manual focus.

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by en103 edited by tmpchaos
last modified: 2011-05-07 18:57:40