I need some help understanding crop factor. I do get that the actual focal length doesn't change, but as far as field of view and how the image turns out is where I'm getting stuck. Anything that I've been reading online is not very clear on this subject. If anyone could explain how this works in a simple way, I'd appreciate it. :)
Crop factor is the ratio between a full frame sensor (36X24mm) and the sensor you're looking at.
While the same photons go through your lens, a smaller sensor will only "see" part of them as you can see here:
The perspective does not change but because you're seeing only part of the image it seems that you magnify it, hence, 50mm lens on a camera with crop factor of 1.6 (meaning that full frame size/the sensor size = 1.6 )will act like 80mm lens on a full frame camera
Quick answer, the crop factor times the focal length is the visual equivalent of the focal length on a 35mm camera. So a 35mm, full frame sensor has a crop factor of 1 and crop factors either go up or down from that depending on their relative size. Greater than 1 is a smaller sensor (since it appears as if the focal length is longer compared to a 35mm) and bigger sensors are less than 1 (since it appears as if the focal length is shorter compared to a 35mm).
Crop Factor is the relation of the size of the camera's image sensor compared to the industry standard size which is 35mm film format which is called "Full Frame DSLR". To cut the cost of the Camera, manufacturers intend to make DSLRs with smaller imaging area thus the crop factor is conceptualized.
- Black – Full Frame Red
- Red - 1.3x Crop Factor
- Yellow - 1.5x Crop Factor
- Green – 1.6x Crop Factor
When you enlarge images to the same size from different sensors the ones with the smaller sensors will be enlarged more – making it seem bigger. When you install a lens (e.g. for Nikon, FX lenses) to a camera with a smaller sensor (e.g. Nikon: DX cameras) the lens is often said to have a larger equivalent lens size.
Here's a table of equivalent lenses when installed with different sensor sizes:
For more information check these links http://www.kenrockwell.com/tech/crop-factor.htm http://digital-photography-school.com/crop-factor-explained