Once again using roughly a 35mm focal length produced very different images with the different cameras, as seen above. Finally, above you can see less of a difference between the two images shot at mm on both cameras. Crop sensor cameras or APS-C cameras have smaller sensors, and the resulting image magnification is called the crop factor — as you can see in action in the images above.
It varies by manufacturer Canon is 1. Imagine I took the image shot with an 18mm lens on the full frame camera, then zoomed in on it and cropped part of the image out. Making it roughly 1. Or does it? Taking that a step further, you may often hear that the crop factor of 1.
For example, full frame is 24x36mm. These are approximations using just the math, not actual dimensions. But that math does NOT apply to lens focal length which does not change regardless of which camera the lens is mounted to.
A 50mm lens will always be a 50mm lens because the focal length is defined as the distance from the center of the lens middle of the glass elements to the imaging sensor or film plane. That does not change no matter what camera you use. What does change, is how much of the image that the lens is projecting into the camera is actually captured.
Remember I mentioned something called covering power before? This is where it comes into play. Okay, what you see above is a representation of how the light coming through your lens applies to each of the different sized sensors. As your lens is circular, the image produced by it is also a circle. Your camera captures a rectangular portion of that circular image.
Notice how much less of the whole image the smaller APS-C sensors actually capture. That is why lenses made especially for crop sensor bodies called Dx lenses by Nikon will NOT work on a full frame camera. Okay so now you know, and hopefully understand some of the science going on behind the sensor size issue.
But you may be asking some of the following questions:. The short answer here is that yes you can still take great photos with an APS-C or crop sensor camera. This time I set up both cameras with the same focal length lens but adjusted the distance to the subject the Fuji had to be moved back to keep the model the same size in the frame. In the image shot with the Canon, it looks distorted and the arms are exaggerated. Why is that if they were both shot with an 18mm lens?
You tell me — what did I change? Because of the crop factor, the Fuji sees less of the scene so I had to move back to keep her roughly the same size. Camera to subject distance affects perspective — the closer you are, the more distortion you will get. But this can easily work against you as well. If you prefer to fill the lens with a tighter viewpoint, the crop factor might actually benefit you. Having a crop sensor increases the reach of your lens, a big bonus in wildlife or sports photography.
Full frame cameras are still the chosen option among professional photographers thanks to their ability to meet the high standards of resolution and detail, especially for producing print photography in larger sizes. A full frame sensor adds bulk, so if portability is a priority, a camera with a crop sensor might be a more natural pick for you. Full frame cameras require a greater investment than crop sensor cameras.
Crop sensor cameras and full frame cameras have their own unique interchangeable lens ranges but fortunately, full frame lenses can be used on crop sensor cameras though not vice versa. To figure out what the real angle of view will be, just multiply the crop factor magnification amount by the focal length of the lens. For example, a 50mm full frame lens on a crop sensor camera with a 1. Camera brands have specific acronyms to denote whether a lens is designed for a full frame camera or a crop sensor camera so make sure you get the right lens for your sensor!
While cameras with full frame sensors remain the preferred option for professional photographers, cameras with crop sensors can easily serve the needs of many everyday photographers. Not sure whether a crop sensor or full frame camera is better for you? Visit us in store to chat with one of our expert team members and weigh up literally! Mirrorless Sensors Explained. Are Camera Lenses Interchangeable? Name required. Digital cameras have complicated things somewhat.
Film has been replaced by sensors which are usually smaller than 35mm film. Because they're physically smaller, they capture a smaller area of the projected image, resulting in a photo which covers a narrower angle of view. A cropped sensor captures less of the projected image.
The narrower angle of view gives the impression of using a longer focal length. Image by Barry. This narrower viewing angle makes the photo appear more "zoomed in", which poses a problem - if the same lens can produce different images on different cameras, how can you compare lenses in a meaningful way, or predict what field of view they'll cover on different cameras? Crop factor was invented to solve this problem.
Crop factor describes the size difference between a 35mm film frame and your camera's sensor. For example, if your camera has a crop factor of 2, it means that a 35mm film frame is twice as large as your camera's sensor. Modern digital cameras are fitted with sensors of varying size. The best digital SLRs have sensors which are the same size as 35mm film, so they have a crop factor of 1 this is known as "full-frame".
At the other end of the scale, digital compact cameras have very small sensors, and high crop factors of 5 of 6. The higher the crop factor, the more noticeable the "zooming in" effect for a given focal length. You can calculate your camera's crop factor by dividing the diagonal length of a 35mm frame by the diagonal length of your camera's sensor. The numbers can get a bit convoluted, but thankfully camera manufacturers list the crop factor in the user manual to save you time and effort.
This is all very interesting or maybe it isn't! Well, it allows you to make comparisons between different lenses and cameras that would otherwise be difficult to make.
0コメント