Is 18-55 is STM a good lens?
Letting in only a relatively small amount of light means that that the 18-55 IS STM will not be a great lens choice for stopping action in low light, but with the advances we have seen in DSLR low light performance (reduced high ISO noise), this lens has plenty of uses awaiting it.
WHAT IS STM zoom?
The Canon 18-55mm IS STM is a basic zoom for Canon’s 1.6x cameras. This one has Image Stabilization (IS) and STM, a new kind of autofocus motor that makes no noise so your DSLR videos won’t let you hear the lens focusing.
What is a 55 250mm lens used for?
The 55-250 is a telephoto, usually used for subjects at a distance (the soccer players, for example, or wildlife you can’t get close to).