The Canon EF-S 55-250mm f/4-5.6 IS STM Lens is an inexpensive, lightweight entry-level telephoto zoom lens with image stabilization, extremely high image quality for the price, and a useful focal length range that will complement most general-purpose zoom lenses.
Focal Length Range
The most popular (because of least cost) general purpose kit lenses (lenses typically purchased in the same box as APS-C format DSLR cameras) have an upper end focal length of 55mm. The EF-S 55-250mm IS STM Lens obviously starts where these 18-55mm kit lenses end, leaving no gap and adding overlap only at 55mm (and not even 55mm if you look at the distances covered in actual test results).
Focusing
As the STM (Stepping Motor) AF system marches into entrenchment in the Canon lens lineup, the Canon EF-S 55-250mm f/4-5.6 IS STM Lens becomes the 6th EF lens to receive this system.
One of the biggest benefits of STM AF is quiet focusing. The IS II lens was very audible during AF, but while you can hear some light clicks and shuffling in the lens during AF if shooting in a very quiet venue, you will, most of the time, notice no noise during 55-250 STM AF.
Build Quality & Features
When you buy an econo lens, you can expect some cost cutting to show in build quality and indeed it is visible in the Canon EF-S 55-250mm f/4-5.6 IS STM Lens. The first thing you do when installing this lens on a camera is remove the lens mount cap. And the first feature you will notice upon doing so is the plastic lens mount. Canon saves these for their lowest end lens models and this lens has one