Latest about F-Number
Best 70-200mm lenses: top constant-aperture telephoto zooms
BUYING GUIDE The best 70-200mm f/2.8 or f/4 lenses combine a fast constant maximum aperture and top build quality, and are essential additions to any pro's kit bag
Best lenses for bokeh: fast primes for brilliant background blur
UPDATED Here's my choice of the best lenses for bokeh. Isolate your subject and make it stand out against a dreamy blurred backdrop
The best Canon lenses for DSLRs: go longer, wider and closer
Buying guide These are the best Canon lenses for DSLRs – and these EF and EF-S optics are still great to use on mirrorless cameras, too!
What is aperture in photography? The "f-number" is actually key to taking better photos
TUTORIAL What is aperture in photography? Here's what you need to know – and how it affects your images
Olympus M.Zuiko 17mm f/1.8 review
review The Olympus M.Zuiko17mm f/1.8 is a super-teeny Micro Four Thirds lens with real bite
Canon EF 16-35mm f/4L IS USM review
REVIEW Reasonably priced for a Canon L-series lens, the EF 16-35mm f/4L IS USM is also a top performer
The best Micro Four Thirds lenses for Olympus / OM System and Panasonic cameras
UPDATED We round up the best Micro Four Thirds lenses, including primes, ultra-wide angles and super-telephotos
Photography cheat sheet: What are f-stops and how to understand them
Cheat sheet What are the f-stops on your camera or lens? And what kind of effect does changing them have? Our chart explains all
