Auto blur.

With smaller and smaller digital sensors lenses get shorter and depth of field grows. It’s tough to beat the laws of optics but, in my opinion, all those calling for ever faster small lenses to limit depth of field and thus differentiate the subject from its surroundings just don’t get it. That’s yesterday’s technology.

The faster the lens, the larger the lens, which defeats the whole purpose of compactness – the very attribute in a camera that makes you take it with you.

What I think is needed is what I call Auto Blurâ„¢. We already have face recognition technology. So why not add technology to blur everything that is not the main subject. Rollover the image to see what I’m talking about (renders fine in Chrome and Safari on my Mac). Refresh your browser if the image is not visible. Will not work on mobile devices.

This is a typical G1 image with the kit lens at 18mm fully open at f/3.9. Everything is sharp.

Now, in this case, the background in the mouseover version was tortuously conferred using PS CS2 and the lasso tool – not my idea of fun – but why shouldn’t this be a simple user choice in the camera’s settings?

Software is cheap and weightless. Fast lenses are not.

Follow-up: A reader has alerted me to a Photoshop plugin from Alien Skin named Bokeh which provides many options for the blurring of backgrounds. However, the plugin is seriously overpriced at $199, as the key step – selection of what is to be blurred – remains the exact same time consuming process in Photoshop which I had to use above. So it’s not a solution. Combining face/shape recognition technology with auto-blurring is the approach for those who favor picture taking over picture processing.

Further follow-up: Anothe reader has pointed me to Nik Software’s Viveza 2 – see the Comments to this piece. I see two advantages and one drawback. The advantages are that you do not need Photoshop, as the plug-in will work with Lightroom or Aperture. Further, the selection tool in Viveza 2 is truly amazing – exactly what is missing from Alien Skin’s Bokeh which uses Photoshop’s clunky selection tools which are labor intensive at the best of times. But the key drawback of Viveza 2 is that it does not provide adjustments of sharpness which is what the above piece is all about. Instead (click the link provided at the end of Arun’s Comment) you have to resort to machinations in Photoshop once again. So if only Nik Software could add a sharpness slider to all the other sliders in their tool, that would seem to do the trick until Panasonic or Sony do this with in camera software. Or, even better, if Adobe decides to add this sort of thing to Lightroom – now wouldn’t that be nice?