BUYING GUIDE
Which camera lens helps you make the pictures you want?
Compare mount compatibility, focal length, aperture, autofocus, stabilisation, optical quality and handling.
THE SHORT ANSWER
Choose the lens that changes what you can photograph: the view, subject reach, low-light capability or close focus you need. Confirm how it works with your exact camera body.
1. Mount and sensor compatibility
Check the exact lens mount, sensor coverage and camera compatibility. A shared brand name is not enough. An adapter may fit physically while limiting autofocus, aperture control or stabilisation, so verify the complete combination. A smaller sensor changes the field of view for a given focal length; compare equivalent views when considering different camera systems.
2. Focal length: wide, standard or telephoto
Use your existing photos to see which views you miss. Wide-angle lenses help include more of a scene; telephoto lenses frame distant subjects more tightly. A zoom offers framing flexibility without changing lenses; a prime has one focal length and may offer a wider aperture or smaller size. Perspective depends on where you stand, so consider working distance as well as framing.
3. Aperture and depth of field
A lower maximum f-number allows a wider opening, useful for collecting more light or reducing depth of field. On some zooms, the maximum aperture narrows as you zoom in; a constant-aperture zoom keeps it available across the range. Weigh that flexibility against size and weight. For landscapes or studio work at smaller apertures, the widest opening may be less important.
4. Autofocus, stabilisation and video
Check focus accuracy and subject tracking with your camera, especially for moving subjects. Stabilisation reduces blur from camera shake but does not freeze a moving subject. Confirm how lens and body stabilisation work together. For video, assess focus noise, manual-focus behaviour and focus breathing: the change in framing as focus moves.
5. Optical quality and close focus
Compare sample images for centre and corner sharpness at apertures you use, plus flare, distortion, colour fringes and out-of-focus rendering. Check whether corrections depend on camera or editing software. For close-ups, compare maximum magnification and working distance, not only minimum focus distance; you need room to light the subject without the lens getting in the way.
6. Handling, build and buying condition
Consider carrying weight, balance, weather-sealing conditions, filter size and accessible controls. Rent or borrow a candidate when practical. For used lenses, inspect glass and mount condition and test focus and aperture operation. Include a required adapter or hood and check service options. Choose the optical and handling differences that serve your subjects.
Before you buy
Sources & further reading
This is buying guidance, not a hands-on product test. Examples are illustrative; check the exact model and current retailer information.