Sony FE 90 mm f/2.8 Macro G OSS
3. Build quality and image stabilization
In the photo below the Sony FE 90 mm f/2.8 Macro G OSS is positioned between the Canon EF 100 mm f/2.8L IS USM Macro and the Voigtlander Apo-Lanthar 65 mm f/2 Aspherical 1:2 Macro.
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The next part is a manual focus ring as wide as 38 mm. You don't have any AF/MF switch, it's enough to push the ring toward the mount. I often criticize such technical solutions because during the move of the ring you can easily lose the pre-set focus but here everything seems to be working fine. The ring doesn't have any tendency to side play and keeps the pre-set values as it should. It also turns smoothly and is properly damped. Running through the whole distance scale needs a turn through an angle of about 160-170 degrees. Still, it's worth remembering that you can leave the ring in the AF mode and control the focusing manually from the camera level. An advantage of such a solution is an increase of the focusing range and a greater precision of settings.
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Buyers get both caps, a hood and a case in the box with the lens.
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Optical stabilization
Nowadays it is a norm that companies boast of stabilization efficiency on a level of 4 EV. Will the Sony FE 90 mm f/2.8 Macro G OSS be as efficient too? In order to check it we took several dozen photos with exposure times ranging from 1/100 to 1/2 of a second with the stabilization switched on and off. For every set of photos we determined a percentage of out-of-focus shots; then we presented it in a form of a graph of exposure time which was expressed in EV (with 0 EV being an equivalent of 1/80 of a second). The result of our testing can be found below.

The maximum distance between both curves reaches 3.5 EV and such is, in our opinion, the efficiency of the Sony's stabilzation mechanism. It is a good result but it lags behind 4-4.5 EV reached by the best lenses.