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Tamron 180mm f/3.5 Di LD IF Macro Autofocus SP AF

Review Date: Sep 23, 2007 Recommend? yes | Price paid: Not Indicated | Rating: 10 

Pros: very sharp when wide open, stunning sharpness after stop down a bit
Need time to get use to the focusing mode

Got a good copy from ebay. It's a very sharp lens and the sharpness is at least on par with Canon's counterpart. Once you get use to the focusing mode, you can even use this lens to take photos of fast-moving butterflies! Highly recommended.

Some samples at http://www.dchome.net/viewthread.php?tid=292240&extra=page%3D2%26amp%3Bfilter%3Dtype%26amp%3Btypeid%3D20

Tamron 200-500MM F/5-6.3 Di LD (IF)

Review Date: Aug 29, 2007 Recommend? yes | Price paid: Not Indicated | Rating: 10 

Pros: Sharp even wide open, very sharp when stopped down, light weight, work well with 1.4x TC and extension tube (with AF)
It'd be perfect if the lens has IS.

Maybe I have a good copy. The lens can produce sharp images that are comparable to those from EF 70-200 f/4, Sigma 100-300 f/4 and Sigma 400mm APO tele Macro (I have used all of them). This observation is not surprising and is pretty consistent with the latest testing report shown at http://www.photozone.de/8Reviews/lenses/tamron_200500_563/index.htm. Highly recommended!

Some samples can be seen at: