Optics TOP - OS is a FLOP

Haptics / facilities:
Touch right the first time is a clear: The tube is made of similar 'valent [' plastic as well as the comparison of the Canon lens. Maybe you have the velvety Micro-surface rather the impression that fingerprints more show and a paradise for the KTU could be. : Lol:

Commendable as from Sigma used the provided quiver with straps, as well as a lens hood with an additional extension of the tube - you should be placed between the tube and the lens hood - for APS-C format (although we may well question who needs this and whether this brings something - a deeper meaning reveals itself not me).

It is worth mentioning not only the area of ​​the AF switch, but also - for me - was not expecting switch the OS, which allows as with Canon in second on position a Bewegungskompension exclusively in the vertical direction.

Autofocus:
The AF responds by HSM to two tested cameras (70D and 5D³) as fast as that of the Canon 100mm f / 2.8L (is a bit faster), but is contrary to this a little more (but very quiet) heard.

OS (Optical Stabilizer):
Here gets a possibly of Canon optics spoiled heart nearly a SCHOK! Both in position 1 and in position 2 (vertical stabilization), the Sigma Macro is characterized by loud stabilization noise that the sound of the AF Micro motors of the EF 50mm f / 1.8 II would equate a canon experienced photographer succinctly!

Bottom line - Conclusion:
Basically, an objective which is his - in the rival, the Canon EF 100mm f / 2.8 IS USM loose can record and it still has to a somewhat greater distinctness of image, which but the Canon to qualify again for the total optical power able - almost twice as expensive is.

1.)
For anyone who uses his macro exclusively for this purpose on the stand, while no problems as the slower AF (or one focused without this manual), nor to worry about the loud OS has - a unique CHARMS - and even by half of money!

2.)
Each of the somewhat slower focus (as described minimal), and the set up flight distance of organisms by an extremely loud OS does not interfere, is well advised with this lens.

3.)
For each video counts this appearance would be by the sounds of a classic OS NOGO - as long as you do not last for an external microphone off the camera effort]!

4.)
Because of the price / performance difference of optics An absolute top!