There were several Tamron 70-200 with 2.8 aperture in my hands. One is very used, and the second I bought a year after I held the first one in my hands.
In my opinion, this lens is underestimated, since Avito and other trading platforms ask for money for it even less than for 70-200 f / 4 from Canon. In general, the lens reveals itself very well on a full-frame camera, but more on that below.
An interesting mechanism for implementing AF-MF switching of the focusing mode is implemented in this lens. To turn off autofocus, just pull the front wide focusing ring towards you. In this case, a blue bar will appear, which signals that autofocus is off. The zoom ring rotates from right to left, as on your nikons. On native Canon lenses, the default rotation is reversed. You don't get used to it right away, because the focusing ring rotates from left to right. Its filter diameter is 77mm. The gold ring behind the focusing ring is marked almost along its entire length Tamron SP AF 70-200 2.8 II MACRO A001... There is a focusing distance window on the body! Its minimum focusing distance is 95 centimeters. In general, given that the lens is a zoom telephoto with a variable focal length, the MDF has the expected values. The bayonet is metal, the body has a recess for the tripod foot. Moreover, the part that is under the foot is the metal part of the lens body. Further - everything is plastic.
The front lens does not rotate when focusing, so polarizing filters can be used. Lenses gradually loosen the mountings of the inner lens group, and if the new sleeves do not allow when changing the position lens from horizontal to vertical, slide the zoom, then on a fairly used lens, as soon as you lower the front of the lens down, the Tamron 70-200mm f / 2.8 zoom ring involuntarily changes its position. Often with a characteristic knock from the inside. In general, the lens knocks even when focusing. The motor rests against the limiter and backs up.
Autofocus Tamron 70-200/2.8
The focus speed of the Tamron 70-200mm f/2.8 is not bad for a child's toy motor. I consider the focusing speed insufficient for shooting any dynamics, however, if you get used to the idea that the camera likes to twist the giblets of this not fast lens at the most crucial moment, in principle, you get used to it. Tracking autofocus on the Tamron 70-200mm f/2.8 sucks to be honest. At the open and far end, the Tamron 70-200mm f/2.8 has about 30% rejects due to the thin depth of field and handheld movement.
6D focusing many times more accurate than 60D. On the 60D, in principle, with any lens, except for the whale lens, there are a lot of defects. But these are hands, all hands must be trained. At 60x with the Tamron 70-200mm f / 2.8, interesting features of the work were observed - often there is confirmation of focus, but there is no focus. In the dynamics of the crop, a complete "hell and israel" is going on. Frequent misses, plus slow focus. That's why I sold 60ku. Probably, the new owner is doing well. Very annoying runs of focusing distance from and to, on a completely flat spot. In general, this behavior is usually typical for scenes with complex lighting, but here everything manifests itself without any preconditions.
Aperture and sharpness
But blurring the background when shooting portraits is nowhere more chic. Especially at the open end and at the far end. Even though you don’t hear anything that the model tells you, you are passionate about the process. And the models are good, and you are good. Let him stand at the end of the block and think all sorts of crazy things. Sharpness is appropriate over the entire range of f-stop values. In the open, it is more than enough for portraits, and in general, photography. At 5.6, you can not be afraid of autofocus misses, and using the fact that we have a telephoto lens in our hands, even on a crop you can get a good blur of the background.
Blurring the background of the Tamron 70-200mm f/2.8 is a mess at 200mm focal length. Features of working with a telephoto lens are that at the long end the depth of field is very small. In order not to spoil the frame when shooting any objects, it is necessary to constantly control the distance to the object and the aperture. For example, at 200mm at a distance of 10 meters from the object, when the object is a car, it will not completely fall into the field of sharpness (full frame camera).
Color Tamron 70-200
The Tamron 70-200mm f / 2.8 is very fond of sunny weather. When changing lighting, when shooting in the shade of trees, or in the presence of any reflections falling on faces, the skin takes on a tint that is difficult to display during post-processing of the material. Moreover, there is often a wide range of parasitic shades - purple, greenish and violet. It takes a habit to determine on the fly whether the frame will be spoiled, or still, it will be possible to "twist" and not dump a good photo in monochrome. Well, sometimes, nevertheless, you want the original from Canon. The same 70-200 f4.
The macro magnification of the Tamron 70-200 is small. A bumblebee from a distance of 2 meters can be obtained on a third of the frame. For a larger macro, macro rings can be used. With them I removed the dew on the grass. Once it was interesting.