New answers tagged lens-design
According to the Photozone.de, 17-85mm USM is often considered as an upgrade path from the basic EF-S 18-55mm f/3.5-5.6 (not STM) kit lens. Here is reviews of both lenses: Canon EF-S 18-55mm f/3.5-5.6 STM IS Canon EF-S 17-85mm f/4-5.6 USM IS I don't have either of them, you can compare their specifications on DPReview.com, the 17-85 is wider and has ...
The current 18-55 IS is a very sharp lens. Optically superior to the 17-85 over the common range. The build quality is not as good, as well as the AF speed and accuracy. So the 17-85 is an upgrade over the 18-55, but not a big a one. A better choice is the 15-85.
STM and USM are different kinds of focusing motors. Prior to STM, USM was the preferred option because it was fast and quiet (relative to other kinds of motors that are available). However, it isn't fluid which becomes an issue with video. Enter STM which is also quiet (though I'm not sure which is more quiet) and provides a smooth transition as it focuses ...
There are a few potential advantages, for example: The really long focus throw on some cine lenses is very nice for accurate manual focus. A stepless aperture enables some extremely specific special effects (e.g. simulated apodization) by way of changing aperture during an exposure. None of them I would call "significant" when compared to the added ...
While it may not cause a difference in image quality, you'd be better off with photography lenses because of their features, such as autofocus and image stabilization. Granted, not all lenses have these features, but most of your quality lenses are going to.
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