1. Luminous intensity and image stabilization
On paper, are 1: 4-5,6 a anything but fantastic value. The more positive that the maximum aperture is retained focal length of 4.0 to 100. On cameras with a smaller sensor (such as the 7d) one moves through the focal length multiplier of 1.6 in order in the area of a 160-lens with Aperture 4.0. This is quite respectable, especially since I was able to identify any significant weaknesses in the sharpness at maximum aperture. This leaves a fully operational working aperture even at the telephoto end, the aperture value of 5.6. The excellent working image stabilizer (which also wonderfully quiet tinkers in the background) makes even freehand at 300mm and exposure times of 1/60 second even reliably sharp images possible. In some cases even succeed including yet impressive results.
2. build quality and aesthetics
Rarely has so impressed me the build quality of a lens. All elements are perfectly matched. No wheel is too much play, no ring feels cheap. Size and balance are at all zoom levels in a thoroughly pleasant relationship. The work with this lens is thus also an aesthetic pleasure that I often miss when working with digital SLRs. Even the gray-white matt finish has fully convinced me after initial skepticism. Competing products such as the Tamron AF 70-300mm 4-5.6 Di VC USD SP digital lens for Canon may move visually on a similar level, according to test reports - technically but they do not play rudimentary in the same league.
It goes without saying that I myself am very satisfied with the image quality. Nevertheless, I have a reference for people who are interested in this objective because of its compactness: Although the 70-300 is basically compact, the lens hood has stately proportions. Conversely mounted or transported separately they overused the room small but noticeable pockets. I see it, however, no shortage of this remarkable product.
