Foveon is a future bayer slayer. Sigma could end up ruling the sensor market for high end cameras in 10 years.

As with other mirrorless cameras, having the histogram displayed in the viewfinder is a boon, especially when the dynamic range of the camera is less than 10-stops. Keeping the exposure correct with a histogram to help analyze a scene is very useful. Controls

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Sigma’s PhotoPro software has come a long way and will create better images for you than simply using the DNG file. Think of it this way; the DNG files are higher quality than the JPEG files, while the X3F files are higher than the DNG. Each step, from JPEG to DNG to X3F, allows for more latitude and control when processing your images.

Detail and colour is lost because 3 pixels are needed to calculate the colour and brightness (luminance) for 1 pixel. Normally when I write a camera review, the conclusion or verdict would be pretty much based on the sum of its parts. But there are always exception and this review is one of those. It wouldn't be my first choice for travel, since you rarely know what you're going to get the chance to shoot, but it acquitted itself well when I stumbled on a classic car show.

How good is it?

The Sigma sd Quattro offers a full range of advanced exposure controls via the Mode button on the rear of the camera, including aperture-priority, shutter-priority, manual and manual focusing, with three Custom modes so that you can save and recall your preferred settings. There are no auto-everything or scene modes on this camera, which is a veritable breath of fresh air at a time when most manufacturers are stuffing their cameras full of clever technologies that take control away from the user. The aperture or shutter speed are set by using the forefinger-operated control dial on top of the camera which encircles the shutter button, with a smaller rear control dial setting the aperture in the Manual shooting mode and exposure compensation in the other modes. Many users, however, will be tempted to focus manually, and here the sd Quattro offers some useful aids. A peaking display can be turned on in the menus with a choice of four colours, although it can’t be set up as a custom viewfinder display. When the lens is switched to manual focus, pressing the button in the centre of the D-pad engages magnified live view for the most accurate focusing, and the area of interest can be moved around the frame as in AF mode. The Quattro H is able to shoot very detailed images with a distinctly different way of rendering the finest detail. It's this that has won Foveon such a loyal fan base. The sd Quattro cameras' ability to shoot in DNG means is that you can finally edit your Foveon Raw files using a converter other than Sigma Photo Pro. As you might expect, there's a few caveats. When you enable DNG capture on the Quattro H, you don't have an option to simultaneously capture a JPEG (although there is a whopping 13MB JPEG embedded in every DNG, should you want to dig it out). In a recent firmware update Sigma added DNG raw recording (for stills) to the SD Quattro and SD Quattro H. Previously you needed to use the very slow Sigma Photo Pro software to open X3F format raw files from the camera. Now you can simply open the DNG files in Adobe Photoshop like normal.

The Sigma sd Quattro H camera is a unique-looking, mirrorless camera with a unique sensor capable of producing sometimes astonishingly crisp images. The technology involved means this camera is not the first choice for everyone, but should certainly be under consideration by landscape, portrait, architectural and lifestyle photographers.However, the camera does have a Focus Peaking option which allows live view focusing with a digital zoom for accomplishing precision focus in manual focus mode. The camera's apparent weakness in distinguishing color in the yellow/orange part of the spectrum sometimes required a little adjustment of the color response to produce good skintone results. These were very different to the adjustments we'd made for other test shots, so it's something you're likely to need to adjust on an image-by-image (or, at least, subject-by-subject) basis. The adoption of the DNG format does wonders for broadening the system's appeal. Sigma Photo Pro isn't unworkable but it's yet another hurdle standing in the way of the system's adoption, so it's nice to see it circumvented. It's still likely that you'll find yourself having to work a little harder to get the best-possible image results but at least you're more likely to be able to do so in a familiar piece of software.