![]() Sigma produces SA mount versions of 39 of its lenses, which plausibly means the Quattro H has one of the widest choices of own-brand lenses of any mirrorless camera. The obvious appeal of using an existing mount is that the lenses already exist for it. If nothing else, the use of the full-depth SA lens mount means you can use any of Sigma's impressive Art series of lenses. Sigma has tried to mitigate this by adopting on-sensor phase detection in the SD Quattro H. ![]() The second, arguably more important downside, is that most DSLR lenses are designed and optimized for phase detection autofocus and they often perform poorly when asked to focus by contrast detection, meaning you have a wide choice of lenses but perpetually hamstrung performance. The first is, as you'd expect, the wasted space of building a mirror box for a camera with no mirror. There are two potential disadvantages of this approach. This isn't the first time we've seen a camera maker build a camera around a full depth DSLR mount, rather than taking advantage of the lack of mirror to make the camera smaller: Pentax's K-01 took the same approach. In keeping with Sigma's history of idiosyncratic innovation, there are two things that set it apart from the majority of mirrorless cameras: the use of a full-depth DSLR mount (the company's own SA mount) and the use of a Foveon X3 Quattro sensor, which captures light and perceives color very differently from other cameras. Multi-shot Super-Fine Detail mode (X3F only).Dust and splash-resistant magnesium alloy body.1.62M-dot (900 x 600 pixel) LCD rear screen.Hybrid (combined phase + contrast detection) autofocus system.It has a spatial resolution of 25.5MP but uses a sensor technology very different from other cameras, capturing around 38M pieces of information and capable of producing files with far higher levels of detail than you'd expect from a conventional 25.5MP camera. The Sigma Quattro H is a mirrorless interchangeable lens camera with an APS-H (1.3x crop) sensor.
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