Lower numbers translate into wider angles, while larger numbers see a much narrower view and make for a telephoto lens ...

If you make your money from sports or wildlife photography, or just take it very seriously, a top quality super telephoto lens is a must. The new Canon EF 400mm f/4 DO IS II USM is an updated version ...

For example, you can use a telephoto lens to isolate a bird in flight, a flower in a field, or a person in a crowd. To achieve this effect, you need to use a wide aperture, such as f/2.8 or f/4 ...

You don’t need a huge telephoto prime lens to photograph wildlife. Andy Westlake is your guide to some affordable zoom ...

Central sharpness is excellent from f/4.5 to f/11, very good at f/16 ... Bokeh is expected to be smooth with long telephoto lenses and this is no exception. Out-of-focus areas show good gradation ...

Like most Micro Four Thirds (MFT) lenses, this telephoto is incredibly compact ... the maximum aperture is reduced from f/2.8 to f/4. If you’d prefer to extend the reach of the lens further ...

If you make your money from sports or wildlife photography, or just take it very seriously, a top quality super telephoto lens is a must. The new Canon EF 400mm f/4 DO IS II USM is an updated version ...

f/4 is the sweet spot ... but there are more affordable MFT telephoto lenses available if your budget does not stretch this far. To soften the blow, however, the lens does include a 1.4x ...