TRUE Strengths

TRUE Strengths

Every digital camera on the market today has some sort of ASIC (Application Specific Integrated Circuit) to handle processing and the basic functions of the camera. Sigma's latest compact and SLR cameras utilise TRUE II processing engines which handle all the image processing. Richard Kilpatrick looks at the technology behind them.

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Sigma and the Sensor (R)evolution

Sigma and the Sensor (R)evolution

The digital SLR first surfaced in various forms in the mid 1980s, in forms as prototypical as the 120MP sensor demonstrated by Canon is now - using tube, then CCD technology and still video capture. The CCD sensor for single, still shot capture would come into its own with the Kodak DCS and related systems, though these models would continue to be a compromise of five-figure prices and quality barely better than a single-frame capture from a Laserdisc - but in the early days $23,000 to capture 700 pixel wide video frames was not unheard of, with devices like the Fuji ES-1 holding a small specialist market.

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The Foveon Sensor

The Foveon Sensor

The Foveon CMOS sensor, as Sigma users know, is unique among camera imaging devices in abandoning the almost universally used Bayer mask approach in favour of a much more elegant three layer architecture which holds the promise of accurate colour rendition at each pixel site. Here, Julian Ashbourn gives his take on the subject

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Backyard Safari Part 4

Backyard Safari Part 4

In the three previous articles on local nature photography we have looked at the basic camera and lens types that can be used to good effect. If this has got your interest roused, you might have found a more specialized interest and want to get some more suitable gear. Here we look at dedicated lenses that fall into ultra telephoto and macro ranges.

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Which Macro Lens?

Which Macro Lens?

We are talking here about true Macro lenses, not the marketing hype Macros that are really only a close focussing lens. True Macro photography does not start until you reach the reproduction ratio of 1:1. That means that the image on the film/sensor is the same size as the object the image relates to.

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Backyard Safari Part 3

Backyard Safari Part 3

In this third part of our series on local nature photography we takes a look at the medium telephoto lens in the range of around 70-300mm in 135mm format. This also includes, on cropped dSLR’s, the newer ‘super-zooms’ around 18-200mm. After the standard lens, discussed in part two this is probably the next most versatile and widely available kind of lens.

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What is MTF?

What is MTF?

MTF, or Modulation Transfer Function, is a scientific way of measuring lens performance, But isn't that just stuff for Geeks? Well, no, it does have a bearing on a lens' ability to produce sharp images that goes beyond the photographers technique and goes a long way to explain the difference in prices between apparently similar lenses.

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Back in focus

Back in focus

Check out any photographic internet forum, or for that matter any Photographic Magazine's letters pages and you will inevitably come across posts discussing focusing. The terms 'Back focus' or 'Front focus' crop up regularly, and often it is the lens that is blamed. But is it always the case? We decided to look a little further

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Making sense of Sensors

Making sense of Sensors

Over the past half a dozen years or so there have been a myriad of advances in digital camera sensor technology. New advances are still being announced at regular intervals. On top of that, sensor sizes from different manufactures vary from absolutely tiny through to offerings for medium format backs and more.

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Backyard Safari

Backyard Safari

Do you fancy yourself as a wildlife photographer, but don't know where to get started?
Do you think it will be expensive to get the equipment together? Don't have the time to go to all those exotic locations? Well specialist equipment and time away in far flung places just aren't necessary as Ian Andrews explains.

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Winter Photography in Yellowstone

Winter Photography in Yellowstone

Yellowstone National Park is rightly regarded as one of the greatest photographic locations on the planet. Yellowstone was to become the first National Park in the United States when it was formed in 1872. The park is the size of Wales and contains over 10,000 thermal features, over 80% of those found on earth. Roger Reynolds explains the attraction.

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