Canon EF-S 35 mm f/2.8 Macro IS STM
3. Build quality and image stabilization
In the photo below the Canon EF-S 35 mm f/2.8 Macro IS STM is positioned next to the full frame Canon EF 35 mm f/2 IS USM.
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A manual focus ring is the next part of the lens. It is as wide as 9 mm and completely covered by rubber ribbing, utilizing a focus-by-wire, electrical design. It moves very smoothly but, in our opinion, its resistance should have been more pronounced. No distance or depth of field scale can be found in its proximity.
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The front element of the lens is just 19 mm in diameter, slightly hidden in the tube, surrounded by LED lights to illuminate photographed objects better. They are very useful: if you employ the minimum focusing distance, the objects will be situated only about 2 cm away from the front rim of the lens.
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Buyers get in the box: both caps and a special hood which protects the LED lights and also has 49 mm filter threads incorporated into its surface.
Optical stabilization
The producer of the Canon EF-S 35 mm f/2.8 IS STM claims a 4-stop-rated Hybrid Image Stabilization system. Of course we had to check it. In order to do so we took several dozen photos with times of exposure ranging from 1/50 to 1 second with the stabilization switched on and off. For every set of photos we determined a percentage of blurred shots and presented it as a function of exposition time expressed in EV (0 EV being the equivalent of 1/40 of a second). An appropriate graph with results you can find below.

The maximum distance between both curves reaches 3.3 EV and such is, in our opinion, the stabilization unit efficiency. It is a sensible result, although a bit lower than the declared one.