what is the difference between dc and dg sigma lenses?
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What is the difference between DG and DC lenses? The designation DG indicates that the lens has been optimised for digital SLRs but is equally compatible with film SLR cameras. ... DC lenses are designed specifically for digital SLRs with the small, APS-C size image sensor.
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What's the difference between progressive and transition lenses? Progressive lenses feature the nifty ability to adjust your vision for both close range and long distance. ... Transition lenses feature an intuitive technology that allows them to adjust their tint based on the light levels of your surroundings.
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The true resolution improvement comes from the NA increase and not increases in magnification. Optical resolution is solely dependent on the objective lenses whereas, digital resolution is dependent on the objective lens, digital camera sensor and monitor and are closely tied together in system performance.
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Using the Sigma 18-35mm f/1.8 DC Lens on a Full Frame DSLR. While the Sigma 18-35mm f/1.8 DC HSM Art Lens is designed to cover only an APS-C-sized camera sensor, this lens mounts and functions on a full frame DSLR. ... Check out the complete full frame vignetting comparison to get the entire picture.
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Sigma has better manual AF, so if you prefer it for the videos, you may actually rather opt for Sigma Art lenses. ... On the other hand, if you do event photography or shoot video and you need a completely reliable AF, then Zeiss and Sony lenses could be a better choice for you.
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The 35 mm lens is much wider than a 50 mm lens but does not cause nearly as much distortion as the 24 mm lens. Because of this, it can be a wide angle when you want it to be and also a standard if you want it to be!
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Sony uses two mounts for its interchangeable-lens cameras: the A-Mount and the E-Mount. A-Mount lenses are used on traditional DSLRs with mirrors, while mirrorless cameras use E-Mounts. ... The gold-standard lens for any camera, however, is the venerable, versatile 24-70mm f/2.8.
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USM lenses are more professional-grade and better for shooting photos, while STM lenses are geared more towards amateurs and better for video. The STM lenses really are almost silent, as they were built with video in mind.
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The significant difference between these two is the level of oxygen that passes through the lenses. Air Optix Aqua has a Dk/t of 138, whilst comfi Air has an astounding 190 Dk/t value.
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The physical properties of a lens at a given focal length also affect the depth of field. A shorter focal length lens (say 27mm) focused at 5 meters, set at f/4 has a deeper DOF (perhaps from 3 meters in front and 20 meters behind) than a longer focal length (say 300mm), also set at f/4 focused at 5 meters.
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In addition, the 1.59 pure polycarbonate lens tends to scratch more easily than the 1.50, 1.57, and 1.53 lenses, because it's a softer lens material. ... Just like the 1.61 high-index lens, the 1.67 lens reduces the edge thickness for nearsighted (-) prescriptions and the center thickness for farsighted (+) prescriptions.
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The focus is on the Sony and Canon lenses. The Nikon lenses are just there for comparison. So, on average the Canon lenses are around 7 per cent cheaper than the Sony lenses.
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As already mentioned, different scanners have different quality lens and some have different Dmax (ability to scan darks and light areas of details) with better quality. ... It is important to make "pre scan" adjustments prior to scanning for better results.
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The most obvious difference between an f/2.8 and an f/4 lens is in their "brightness", i.e. in the maximum amount of light each lens allows to reach the sensor. ... An f/2.8 lens would usually be capable of giving a more shallow depth of field (and therefore a bigger background bokeh) than an f/4 lens.
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Plastic lenses are lighter and more comfortable to wear all day long, but are much more vulnerable to scratches. The other main difference is that most plastic lenses are highly impact resistant, whereas glass lenses are not.
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Traditional progressive lenses are produced using “pre-molded” templates and the same design is used for every wearer. Digital progressives are customized for each wearer's prescription. This customization eliminates more distortion and will help you transition to and from far and near vision much more easily.
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The optical zoom is achieved by using your camera's lens. The digital zoom, on the other hand, is achieved by cropping and enlarging the image once it has been captured by the digital camera's sensor.