Camera Lens Guide for Beginners
The lens decides much of how your photos look. This guide explains lens numbers, the most useful lenses for beginners and how to look after them.
Updated 10 November 2026
What mm means on a lens
The mm number is the focal length. 10–24mm is wide angle (rooms, landscapes), 35–50mm is natural (street, everyday), 85mm is portrait, and 70–300mm is telephoto (sport, birds). A zoom lens covers a range such as 18–55mm; a prime lens has one focal length such as 50mm.
What the f-number means
f/1.8 or f/1.4 lenses let in more light and blur the background more. Kit zooms are usually f/3.5–5.6. The famous 50mm f/1.8 is the cheapest big upgrade for portraits.
Lens mounts
Lenses fit only their own mount: Canon EF/EF-S (DSLR) and RF (mirrorless), Nikon F (DSLR) and Z (mirrorless), Sony E/FE, Fujifilm X, Micro Four Thirds and L-Mount. Canon and Nikon sell adapters so DSLR lenses work on their mirrorless bodies.
Best first lenses
- Kit zoom (18–55mm) that comes with Canon EOS 2000D DSLR Camera or Nikon D5600 DSLR Camera.
- 50mm f/1.8 for portraits.
- 70–300mm (such as the Canon 75–300mm) for sport and wildlife on a budget.
- 10–18mm wide angle for travel and real estate.
What VR, IS and OSS mean
They are stabilisation names: Nikon VR, Canon IS and Sony OSS reduce blur from shaky hands.
CCTV lenses
Security cameras have fixed lenses (2.8mm wide, 4mm, 6mm narrow) or varifocal lenses (for example 2.8–12mm) that you can adjust after mounting. PTZ cameras zoom optically; see PTZ cameras.
How to clean a camera lens
Use a blower first, then a lens brush, then a microfibre cloth with a drop of lens cleaner. Never use tissue or shirt cloth. Store lenses with silica gel to stop fungus.
