這些是我找到的--200mm左右的鏡頭，那款好一些？

Sigma AF 18-200mm f/3.5-6.3 DC OS (Optical Stabilizer) Zoom Lens for Canon Digital SLR Cameras



Tamron 18-250mm F/3.5-6.3 AF Di-II LD Aspherical (IF) Macro Lens for Canon Digital SLR Cameras



Canon EF 70-300mm f/4-5.6 IS USM Lens for Canon EOS SLR Cameras



Canon EF 70-200mm f/4L USM Telephoto Zoom Lens for Canon SLR Cameras



Sigma 170-500mm f/5-6.3 DG RF APO Aspherical Ultra Telephoto Zoom Lens for Canon SLR Cameras


Canon EF 70-300mm f/4-5.6 IS USM Autofocus Telephoto Zoom Lens - Refurbished by Canon U.S.A. （refurbished $450)


Sigma 18-200mm f/3.5-6.3 DC Lens for Canon Digital SLR Cameras ($355)

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Canon EF 70-200mm f/2.8L USM Telephoto Zoom Lens for Canon SLR Cameras.
Should be f/2.8 mm.
not f/28 (typing error).

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Canon EF 70-200mm f/28 L USM Telephoto Zoom Lens for Canon SLR Cameras
這隻鏡頭可作首選。