![]() ![]() Essentially it means that APS-C shooters will be able to use lower ISOs when shooting wide open in low light and get similar levels of image noise, substantially negating one of the key advantages of switching to full frame.Īs we'd expect at this level, the lens uses an ultrasonic autofocus motor for fast, silent focusing. This is important as it's a major determinant of image quality. By this we mean that it will be able to project an image that's just over twice as bright onto a sensor that's slightly less than half the area, meaning the same total amount of light is used to capture the image. What's more, combined with an APS-C sensor, the system will also offer effectively the same light-gathering capability as an F2.8 lens on full frame. Sigma's choice of F1.8 as maximum aperture isn't a coincidence it means that the lens will offer the same control over depth of field as an F2.8 zoom does on full frame. This all bodes well for the company's latest offering - the record-breaking 18-35mm F1.8 DC HSM, which is the first constant F1.8 SLR zoom lens to hit the market. Most recently the 35mm F1.4 DG HSM impressed us with its exceptional optical quality at a very competitive price. ![]() The original (and recently-replaced) 30mm F1.4 EX DC HSM has long been one of our favourite lenses for APS-C SLRs, and the 50mm F1.4 EX DG HSM grabbed our attention back in 2008 due to its sharpness at large apertures. Over the past few years we've seen increasingly ambitious concepts appear from the company's design studios. This means it can no longer compete in the same way on price alone, and it's therefore switched its focus towards higher-value offerings. But this has changed over the part decade or so while other companies have shifted manufacturing to cheaper locations such as China and Thailand, Sigma has stubbornly refused to move from its factory in Aizu, Japan. ![]() In the film era it was best known for relatively inexpensive lenses that undercut the camera makers' own equivalents in terms of price. Sigma has a long history as a lens maker, having been founded over 50 years ago. ![]()
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