Sensitivity (ISO) in digital imaging is the subject of quite a lot of confusion - it's becoming common to hear talk of manufacturers 'cheating with ISO.' Here we look at why sensitivity can be hard to pin down, why we use the definition we do and how it's really as complicated as it can seem.
We've just posted the second part of our blog post about ISO and Sensitivity. Last week we looked at what the ISO standard is supposed to tell us (the key thing being that it's based on JPEG middle gray and therefore is dependent on the manufacturer's chosen tone curve). This week we have a little look at what's going on behind the scenes when many modern cameras try to boost their ability to capture highlights.
Just posted! Our lens review of the Panasonic Lumix G 20mm F1.7 ASPH (also known, somewhat cyptically, as the H-H020). There's little doubt that this year's small-bodied Micro Four Thirds cameras have attracted a lot of attention, and by way of an appetiser for our upcoming Panasonic GF1 review, we take a look at its compact, large aperture kit lens. True to the system's spirit of cross-brand co-operation, we've also taken the opportunity to shoot an extensive samples gallery using the Olympus E-P1. Click through to discover whether we found the lens to be up to standard.
Just Posted: Our preview sample gallery from the Canon PowerShot G11. It's the first time in the G-series' history that the nominal resolution has decreased on a new model. We've got hold of a production version of Canon's latest flagship compact camera and so you can see for yourself what impact this move has had on the image output. As usual we've made sure to include a variety of light situations and ISO-settings.
We're seeing an increasing number of posts on our forums expressing confusion about ISO and asking why we don't test cameras based on their 'true' ISO values. So we've just posted the first of a two-part explanation of ISO, what it means, the role it plays in photography and how apparent discrepancies in reported values can occur.