New answers tagged used-equipment
2
You mentioned that your main subjects are landscape and architecture, for these 2 you will mostly need the wide lens, specially for architecture, and the Tokina 11-16mm will be great for that use.
The lenses you listed are all super zoom lenses and I don't think you'll ever have to use 100mm or more in landscape and architecture photography. The super zoom ...
3
Fixed aperture is a very good feature that only one of those has. It just makes it easier to meter, control dof, and use fill flash. So go for the tamron. It is even pretty sharp. and super zooms are never a good idea, as they really make you feel disappointed at your DSLR.
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It's not a guarantee, but a general rule of thumb is that the longer the range of focal lengths, the lower quality the lens. The majority of those lenses have extreme focal ranges. Beyond that, shopping questions are generally considered off topic and this is very much a shopping question.
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