DSLR cameras that we use generally have used APS-C sensor size or smaller than the size of a full frame 35mm sensor. APS-C sensors will impact the crop factor of the lens is mounted, so the lens focal range will be 1.5 times longer. For that we serve article that hopefully can help the reader in choosing the right lens crop factor associated with it.
Initially in the film SLR era, each focal lens will give what the actual focal-existence. A 50mm lens will give you perspective and angle images that are like that should be a 50mm lens. With the digital age that use APS-C sensors, then there is an adjustment in which each lens is mounted so that will be corrected 1.5x 50mm lens will be equivalent to 75mm. As a result, a wide lens is no longer too wide, and telephoto lens will be the tele.
Crop Factor
It is now mostly produced special lens APS-C sensor, such as the EF-S lenses (Canon), DX lenses (Nikon) and also made other lens manufacturers such as from Tamron, Sigma or Tokina. This lens is smaller, with a diameter smaller image area (adjusted for sensor size) and are not suitable to be installed in full frame DSLR. Do we have to always choose the kind of lens is this? Not really, there are no restrictions for owners of DSLR APS-C to full frame lenses, let alone full frame lenses have more choice and generally professional lens is a full frame lens.
Either full frame lenses and specialty lenses DSLR APS-C both fixed focal lens is made with the appropriate specification standards. For example, although a 35mm DX lens Nikon made specifically for the Nikon APS-C, 35mm focal but still will be corrected so that the equivalent of 52mm. So any lens mounted on an APS-C camera it will remain the effective focal experienced crop factor.
Basic beginner mistakes in choosing lens crop factor is that he ignores, though not fatal but can bring disappointment. A person who bought the Canon 17-40mm lens might be disappointed when setting up this lens on the EOS 60D camera, because she will never be able to feel the 17mm wide focal imagined. Who bought a 28-300mm lens might be surprised at the wide capabilities of this lens is actually 42mm instead of 28mm (42mm is no longer classified as wide).
Here we present some lens focal favorites in film photography era, and how the effect when terkenacrop factor and lenses as what needs to be purchased by the APS-C DSLR owners to be able to have the same focal lens as the lens:
1. Fix normal : 50mm
This is the most popular lens among photographers of the past. As the name suggests, fixed lens can not be zoomed, but advantage could have a very large aperture lens. This lens when mounted on an APS-C camera will be corrected to 75mm. Therefore if you want to feel focal 50mm, seek for 30mm or 35mm lens.
2. Wide zoom : 17-40mm (Canon), 16-35mm (Nikon) etc
This is the lens that a wide class of luxury wideangle photography lovers dream. Such lenses are generally sold over 10 million dollars. When the lens is mounted on APS-C cameras the focal will be 26-60mm is not so wide. The solution, look for wide lens for APS-C like the 10-22mm (Canon), 10-24mm (Nikon), 10-20mm (Sigma) and so on. Although not able to match the actual 17mm wide, at least APS-C DSLR users can still feel the sensation of a 20mm wide angle.
3. Zoom normal 1 : 24-70mm
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This is the normal zoom lenses most preferred because of the ability of the fotogafer wide and tele pretty hefty. When the lens is mounted on APS-C DSLR will be a 36-105mm wide which is no longer. To be able to feel the 24-70mm focal, APS-C DSLR users should buy a 17-55mm lens (Canon-Nikon), 17-50mm (Tamron-Sigma).
4. Zoom normal 2 : 28-80mm (Canon), 28-70mm (Nikon)
Another option normal zoom lens especially in earlier times is 28-80mm will be responsible when mounted on APS-C DSLR, because it will be a focal 42-120mm which is not common. Currently if you have a DSLR with 18-55mm kit lens, this lens is its focal today could arguably match the 28-80mm lens at earlier times.
5. Super zoom / all round : 28-200 atau 28-300mm
The first was already known focal lens that can reach wide 28mm to super-tele 200mm and even 300mm telephoto lenses like 28-200mm and 28-300mm. When the lens is mounted on APS-C DSLR camera, again 28mm wide position will be responsible for developing crop factor to 42mm. If you would like a very long lens range, buy lens 18-135mm or 18-200mm for APS-C DSLR cameras you.
6. Tele zoom profesional : 70-200mm
This is a professional grade telephoto zoom lens which is commonly called the thermos lens (due to size) and cost about 20 million. If you whim buy this lens in APS-C DSLR camera, you will get the advantage of got a longer telephoto range that is to be 100-300mm. But if you have a DSLR APS-C and does want a lens with 70-200mm focal, you can buy a lens like the Tokina 50-135mm or Sigma 50-150mm.
7. Tele zoom : 70-300mm
This is a telephoto lens the most popular among beginners and hobby of photography, because it is cheap and fairly long tele. When the lens is used on APS-C DSLR, the advantage is a very effective lens focal length is 100-450mm. Then the lens is very well liked by the owner of a full frame DSLR and APS-C DSLR. But if you are the owner of APS-C DSLR feels like to have a lens with 70-300mm effective focal, then you can just buy a cheap telephoto lens like the 55-200mm.
As a guide, the following conversion table for some focal crop factor common, where Nikon, Pentax and Sony was perkaliannya 1.5 while Canon was 1.6 times (used Olympus Four Thirds sensor with 2x crop, not discussed here).
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