As image sensors have increased in resolution, and modern lens designs in sharpness, more full-frame 35mm and APS-C digital cameras have omitted the filter, the logic being that it's better to address moiré when it does pop up in an image rather than to sap detail from every photo.
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It's easier to reduce moiré via software when working with high resolution images, which is one of the reasons that they've long been omitted from medium format digital cameras. It does this by slightly blurring an image, at the cost of very fine detail. These can show up as rainbow patterns when shooting certain textures, notably textiles and feathers. The OLPF is designed to reduce the possibility of color moiré effects in images. The Alpha 7's 24-mexapixel image sensor is the same physical size as the one found in the Alpha 7R (and Leica M), but it has something that those cameras lack: an optical low pass filter (OLPF). Lenses don't have an o-ring gasket around the mount, so I'd be a little wary of using the camera in very heavy rain. The body itself is sealed against dust and moisture I had no issues shooting in lighter rain. The Leica gets some of its extra weight from its brass construction and optical viewfinder the Alpha 7's extra height is due to its built-in OLED EVF. The Leica M (Typ 240) ($4,999.99 at Amazon) (Opens in a new window), the first full-frame mirrorless camera with Live View, measures 3.1 by 5.5 by 1.7 inches, but is heavier at 1.5 pounds. Quite compact when you consider its full-frame image sensor, the Alpha 7 measures just 3.75 by 5 by 1.9 inches (HWD) and weighs about a pound without a lens. For an extra $600 you sacrifice just a little bit of speed, but gain a 50 percent increase in image resolution and a images that are critically sharp thanks to a sensor design that omits the low pass filter. The camera is impressive and a joy to use, but we give the edge to the 36-megapixel Alpha 7R, which earns our Editors' Choice award for full-frame mirrorless cameras. The Alpha 7 is built for speed thanks to a 24-megapixel image sensor with on-chip phase detect autofocus sensors and a 5fps burst shooting rate. Aside from the model badge, it looks the same as its twin, the Alpha 7R ($1,654.95 at Amazon) (Opens in a new window), but the two cameras are quite different internally. The Alpha 7 ($1,699.99 direct, body only) is one of a pair of new full-frame mirrorless cameras from Sony.
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