Sigma & Tamron 18-200 review

[TheObiJuan]

Here is the link translated into English for those that have not seen it.
http://translate.google.com/translat...language_tools

The final images are all of the sigma 18-200.
I was waiting for some review like this to sway me. I just purchased the sigma 24-70 f/2.8 and will buy the sigma 70-200 f/2.8 soon, but I may pick this up too.
I am going on a cruise this summer for my honeymoon and wouldn't mind hauling only this and the fitty around.

The 18-125 is also compared.

[TheObiJuan]

The sigma 18-200 is just as good as the sigma 18-125 and better in many aspects. I especially love the minimal vignetting. The sigma has better build quality and even a metal lens mount. It has zoom lock, I dont know if the tamron 18-200 does.

I wish the sigma had the same true focal range that the tamron 18-200. It appears that the 200mm end of the sigma is more like 170mm or so. Or it could be that the tamron 200mm is more like 230mm.
When I get it I will do some testing.
Here are some pics that I borrowed from a Japanese review. Credit goes to them for their hard work. ;)

I labeled and assembled them to illustrate the difference.

Note the sharpness.

Note the chromatic abboration.

This one is at 200mm at f/6.3 and 1/1250

[TheObiJuan]

I noticed that the 18-125 does give more contrast. The extra sharpness increases acutance, which makes images sharper. It is sharper at 125, it's maximum focal length, just like the 18-200 is very sharp at 200, it's maximum focal length. At 80mm, though, the sharpness is astounding. To tell you the truth, the only difference is the gain in "75mm" and less vignetting.







It should be worth noting that the sigma 18-125 in the 125-135 test shot was shot at f/6.3, which is stopped down 1/3 stop, where the 18-200 was wide open. This could have an effect in adition to the 18-125 being at the end of its focal range (125).
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