What is the tamron 25 200mm f 2 8 5 6 di iii vxd g2 good for?

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From Tamron 25-200mm f/2.8-5.6 Di III VXD G2: Tamron 25-200mm f/2.8-5.6 Di III VXD G2: A zoom lens by Tamron for Full frame cameras, 25-200mm f/2.8-5.6. The second-generation version of the 28-200mm, now starting at 25mm. Specs - Maker: Tamron - Focal length: 25-200mm (zoom) - Maximum aperture: f/2.8-5.6 (it gets darker as you zoom in) - Made for: Full frame sensors - Mounts: Sony E - Stabilised: no - Autofocus: yes What it frames like - On full frame (Sony E): as marked, 25-200mm. ...

From Lenses: Aperture: The f-number says how wide the lens opens. Smaller numbers let in more light: f/1.8 lets in about ten times as much light as f/5.6, more than three stops. A wide aperture means faster shutter speeds in dim light and more background blur. Zooms with a constant aperture, like a 24-70mm f/2.8, keep the same exposure throughout the zoom range; cheaper zooms get darker as you zoom in.

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