So I made the first shots with the lens and I am mostly very satisfied. The sharpness is great!
For AF: As I said, I start first with the Makrofotgrafie and perhaps the following with the AF normal, I do not know. With the 90mm, it is not at all always so simple, the desired subject, for example, to see a small insect, if you look through the camera. Due to the short distance to the object and the narrow focal plane have to be extremely careful with camera shake, even at large aperture. This zickt and pinks of the AF pretty quickly back and forth, can happen that the AF in the moment in which you want to enforce is just wrong! I quickly got behind, that it is better on such short distances, to select a fixed focal point, and not to use the whole field AF! This confuses the AF and therefore the focal point may soon be on something else.
With regard to the panel: It is important that, depending on the distance to the object (and adjusted focal region of the lens) changes the aperture! This means:
- If the focus distance set to infinity, you reach the max. Aperture of f2.8
- Between infinity and 0.5m drops to the max. Aperture gradually starting to F3.8
- Between 0.5m and 0.3m, the aperture drops gradually from to just f5.6!
But that's not so bad, on the contrary, because even at an aperture of f5.6 and a distance of only 0.3 m the focus range is extremely low, as would an aperture of f2.8 absolute madness. The already with f5.6 is much too little spicy! But nonetheless, the objective is therefore in reality a variable aperture!
The processing of the lens is absolutely fine. It is gefertig of high quality plastic, this case has nothing game and nothing wobbles. Metal as production materials would also be more difficult to some. If one wants because sometimes little things to photograph out of his hand, it would be much more difficult to maintain in the long term the objective calm. The switches are okay, but could be moved a little smoother. The great thing is that the lens is protected against splash water. This shows a the rel. thick rubber lip on the bayonet.
All in all I am very satisfied so far. The AF could still one tick work faster for my taste, but it was nevertheless very fine. For this, I would deduct half a point. But since this does not work, I'll just leave it at 5/5 stars because it's just great for the price. I'm not sure whether the Nikon 105mm or 100m Canon macro as are so much better (but see sharpness test below).
Nice side effect for macro lenses the way: you can see first how much dirt is on the sensor, since you often have to stop down far;)
I can say only: Tamron, you did again well done!
If necessary, I will extend this recession over time.
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Addendum of 13/08/2014, sharpness test by the smallest possible aperture 5.3 to the greatest possible aperture of the 64th
I have the lens now subjected to a little sharpness test. The design used was a flight ant that is inadvertently intruded into my room and thus once (albeit unintentionally) became my present test object. Was focused on the legs (the flight ant lay on his back) by AF, which then but disabled to avoid a renewed fehlfokusieren. The camera was also mounted on a very stable tripod. The ant was lit next to the room light with a flash (Nikon SB-700), which was directed approximately 5cm away in 45 ° at the subject. The photographs were taken by Thetering via Lightroom to even once again to avoid pressing the release button and thus shake. The resulting images I've seen in 100% view on my PC monitor.
The stops, which I photographed were 5.3, 5.6, 6.7, 8, 9.5, 11, 13, 16, 19, 22, 27, 32, 38, 45, 54, 64
Long story short:
The lens is excellent focus to a panel of F19 (even at full aperture). From aperture 22 the sharpness then fell markedly (diffraction blur). In the last four or five stops one might have thought, the focus was sitting wrong. But no, here the subject is really quite out of focus (however, in the 100% view !!). Zooming back completely out of the picture, you realize this blurring already less, yet. The sharpest image quality rendered the lens in my opinion, between the aperture values 6,7 and 9. I wonder if the 105s Nikon would cut here better.
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