In the middle of its range, around 35mm, it is perfect for street, travel, and documentary photography, while the short telephoto zoom of 55mm works wonders for portraits. In circumstances where you're likely to need to change focal lengths and aperture frequently and quickly, the 18-55mm lens is a great choice.
Getting the best out of your kit lens
The 18mm is a moderate wide-angle lens that is great for landscapes, architecture, and environmental portraiture. The 55mm end makes for a short telephoto lens, ideal for compressing perspective when taking portraits or closing in on small details.
What kind of lens do professional portrait photographers use? Most professional portrait photographers swear by an 85mm f/1.4 or 85mm f/1.2 lens. It's the best combination of focal length and wide aperture, producing beautiful bokeh.
Keep a good distance between the subject and whatever is in the background. Bring down the aperture size as low as possible. At 55mm, the maximum you'll be able to open up is f/5.6. Here you can see how big this hallway is and how far are the things from where the model was standing.
The 18-55mm lens is a zoom lens that can change focal lengths to help you capture various angles. A 50mm lens is a prime lens with a fixed focal length, which means it cannot zoom in or out. Although the 50mm cannot zoom, it does have a wider aperture allowing it to perform better in low light conditions.
The biggest difference in performance can be seen in the corners at the fastest apertures (f/1.8, f/2.8 and f/4). Whereas the 55mm's corner sharpness at all three values is only slightly worse than at the smaller apertures, the 50mm is clearly softer at f/1.8 and f/2.8 and marginally softer at f/4. What is this?
The best thing about the 18-55mm lens is its versatility. At 18mm, it is fairly wide-angled and is great for landscapes. In the middle of its range, around 35mm, it is perfect for street, travel, and documentary photography, while the short telephoto zoom of 55mm works wonders for portraits.
Ideally, for a blurred background, you should use a lens that has at least an f/2.8 aperture available. Lower f-numbers will offer even more blur. A 50mm f/1.8 is even better, with several manufacturers offering options for less than $300. An f/1.4 is even blurrier, but these lenses sit at a much higher price point.
Canon EF 50mm f/1.8 STM Lens
The wide f/1.8 aperture on this Canon bokeh lens focuses clearly on your subject and creates stunningly blurred backgrounds. These characteristics are perfect for capturing portraits since they make your subject stand out. It's no surprise it's one of our favorite Canon 50mm lenses.
Portrait photographers prefer wider apertures like f/2.8 or even f/4 — they can focus on the subject and blur the background. That's also why landscape photographers typically shoot in the f/11 to f/22 range — they want more of the landscape in focus, from the foreground to the distant horizon.
The closest focal length to the perspective of our eyes is the 50mm lens. However, photographers, in general, consider a portrait lens from 85mm up to 110mm. These lenses give you significant background blur and a shallow depth of field. They also allow you to position your subject far away comfortably.
For portrait photography, 50mm lenses are great for full-length and waist-level portraits, both on location and in the studio. This is thanks to the wide field of view compared to an 85mm or 135mm lens, and you don't need to be too far away from the model to achieve these crops.
An 18-55mm lens on a camera with an APS-C sized sensor is equivalent to about 28-85mm full frame (FF). It is a general purpose lens that goes from medium wide angle to short telephoto. If you are photographing a group of people at 8-10 ft you will be able to get 3-5 people in the frame at 18mm but probably only one.
Even bumping the zoom in a couple of millimeters from 16mm to 18mm can make a notable difference in image quality. All in all, 18mm is one of the most useful focal lengths for landscapes—right up there with 21mm below.
Many photographers use prime lens to achieve bokeh. But its, possible to achieve bokeh effect using kit lens also.
The 18-55 is worse than the 18-135 wide open at 18mm, but there's not much difference between all three at 55mm. By 135mm the 55-250mm is significantly better than the 18-135mm in terms of C.A.
The Canon EF-S 18–55mm lens f/3.5–5.6 is a Canon-produced wide-angle to mid telephoto zoom lens for digital single-lens reflex cameras with an EF-S lens mount. The field of view has a 35 mm equivalent focal length of 28.8–88mm, and it is a standard kit lens on Canon's consumer APS-C DSLRs.