Thanks Craig. My cubicle mate at work has the Nikon 18-200 VR and I am almost ready to swap my Canon for a Nikon just for that lens
I had a play with both Sigma and Tamron in the shop today and I really don't see a whole bunch of difference. I reckon I may have to take my camera in and take a few test shots with both of the lenses.
Just fyi - here is a side-by-side paper specification comparison. I'd be interested if anyone has used either or both of these, and what the experience has been like.
Model name..............Tamron AF 18-200 f3.5-6.3 XR Di......Sigma 18-200mm F3.5-6.3 DC
Focal length............18-200mm.............................18-200
Max aperture............F/3.5-6.3............................F3.5-6.3
Angle of view...........75° 33' - 7° 59'.....................69.3 - 7.1 degrees (SD format)
Lens constr.............15 elements in 13 groups.............15 Elements in 13 Groups
Min focus distance......0.45m (17.7")........................45cm / 17.7 in.
Maximum magn. ratio.....1:3.7 (at f=200mm MFD 0.45m).........1:4.4
Filter diameter.........62mm.................................62mm
Overall length..........83.7mm (3.3") *......................78.1 (3.1in)
Maximum diameter........73.8mm (2.9")........................70mm (2.8in)
Weight..................398 grams (14oz.) *..................405g / 14.4 oz.
Diaphragmblades.........7 blades.............................7 Blades
Minimum aperture........F/22.................................F22
Standard accessory......Flower-shaped lens hood..............Petal Hood
Lens Mount..............Plastic..............................Metal
Price (new).............600..................................450