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...
Author: Jon Tarrant
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...
Perspective on perspective
If you use wide-angle lenses mostly for getting more in the picture then you’re missing out on a different perspective...
Optimum pinhole size
Digital photography is possible using nothing more sophisticated than a simple pinhole. But what is the optimum pinhole size to...
What affects your lens choice in any or all situations?
What affects your lens choice in any or all situations? Budget is obviously a factor but lens choice is also...
Centre-field image quality
If you use a full-frame lens on a smaller-format sensor, what happens to image quality? Does using only the centre...
Lens simulators
Cyberspace offers its own opportunities to preview the effects of lenses that you might be thinking of buying: welcome to...
Achromats and Apochromats
The language of lenses has become simplified in recent years but, although the comparison between achromatic and apochromatic lenses is...
DxOmark website
It is one thing to test a lens but what effect does the host camera body have on the results?...