Decodes the Canon Digital SLR Lens
As we enter the new world of digital SLR cameras which one is confusing enough to translate the meaning of the lens. In this blog I try to explain the various models of the lens and its meaning.
Decodes the Canon Digital SLR Lens: Canon EF-S
means that the lens models that are designed specifically for DSLR cameras with a crop sensor / small (relative to the film camera (full frame). These lenses can not be used for installation in full frame DSLR cameras like the Canon 5D or Canon 1Ds.
18-55mm: This lens focal range. For those who are experienced in using a film camera, lens focal range is equivalent to approximately 29-88mm. Focal range of this lens is versatile enough for everyday use.
f/3.5 – 5.6: This means a maximum aperture range. At 18mm focal range, the maximum aperture is f/3.5, while at the 55mm focal range, the maximum aperture is f/.5.6.
IS: It stands for Image Stabilization, which means that this lens has the ability to dampen vibration of our hands so that the resulting image does not blur. This feature is very useful especially when we take a photo with the lighter low-speed setting.
Another example.
When you see numbers openings only one course, as lenses above (f/2.8), this means that this lens has a constant aperture. From 17 to 55mm focal range, the maximum aperture we can use is f/2.8.
USM: It stands for Ultrasonic Motor. This marks inside the lens there is a built-in auto focus. USM also indicates auto focus faster and silent.
Lens above it only has a focal range of 50mm. This means that the lens is not a zoom lens (you can not zoom using this lens, to zoom in / out objects, you must approach the object or away from the object).
This lens also has a code of EF not EF-S lens, which means it can be used in full frame camera.
Above the lens is also called focal range telephoto zoom range is quite large because the 70-200mm
Unfortunately the code does not apply universally lens, so the lenses of other brands will have different codes. But no problem, usually the same code structure. List of abbreviations below will facilitate your understanding of the lens instead of Canon.
HSM: It stands for Hypersonic Motor. That is roughly equal to USM, rapid auto focus and silent. This code will be found in Sigma brand lenses.
AF-S: Same as above code, this code will be found in the lens of the Nikon brand.
SAM: Same as above code, this code will be found in the lens of the Sony brand.
AF: Nikon lenses that do not have a built-in auto focus. In the beginner camera like the Nikon D60 and D5000, can not use this lens for auto focus, but should be with the manual focus.
VR: It stands for Vibration Reduction, the same function with Image Stabilization.
OS: Abbreviation of Optical Stabilization, the same function with Image Stabilization. This code will be found in the Sigma lens.
VC: Stands Vibration Compensation, the same function with Image Stabilization. This code will you find on the Tamron lens.
DX, DT, DC: The code in optimizing lens for crop sensor cameras. This code will you find on the Nikon lenses, Sony or Sigma.
DG: The code is in the compatible lens for crop sensor cameras and full frame. This code will be found in the Sigma lens.
So, hopefully can help.
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