Jon Tarrant

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Lumix G1 AF accuracy

Does the latest move towards sub-miniature (Micro Four Thirds) cameras suggest a lowering of lens and focusing standards? Not if my experience with Panasonic's Lumix G1 body and its matching Lumix G 20mm lens is anything to go by!

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Why vary the aperture?

Picture-taking has become such an automated process that it is sometimes useful to pause and think about the reasons why we do certain things, such as stopping-down a lens to give a smaller aperture...

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Diffraction-limited

“Diffraction-limited” is a term that is often bandied around in the context of lens performance so it’s time to look at what it really means. Before that, dash off and get a current copy of What Digital Camera (March 2010) because you’ll want to look at one of the pictures inside.

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As Good as New

It is a sad fact that many lenses arrive for review in something of a sorry state, with items missing from the box or generally looking the worse for wear. I’m now starting to wonder whether this might affect the results of their tests...

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A couple of weeks ago I promised to report on an apparent problem concerning inaccurate focussing when an off-centre AF sensor is selected. I have now completed my first tests on this and can reveal the results...

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Sometimes a lens can look great on paper but prove disappointing when you use it in the field. This is a crucially important reason for buying lenses from a physical camera shop where you can handle and even test a specific lens before you buy it. Our brief tour of the way in which What Digital Camera’s lens scores are calculated therefore comes to an end with the figures that tell you how well the lens works overall, both physically and optically in the real world.

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