For a lot of photographers, the commonly accepted definition is that a normal lens focal length is determined by the diagonal measurement of the image area, the film frame. For the 24mm x 36mm format of Full Frame, that is 43.3mm and for an APS-C frame, 30.1mm. Photo by pick-uppath via iStock.
The same reasoning applies to full frame or APS-C digital sensors. While the former is 24 x 36 mm in size, the latter is 16.7 x 25.1 mm. The lenses designed for full frame have more image circle than what is needed for an APS-C digital sensor, while the reciprocal does not apply. A full frame lens will work in APS-C but not the contrary.
Unless qualified further "equivalent" focal length means the focal length one would need on a full frame camera in order to get the same field of view (or same magnification) as produced by the given lens on that other (smaller or larger format) sensor. As an example a 50 mm lens on APS-C has an "equivalent" focal length of 75 mm. The Bottom Line
For a FF lens the FOV is 47 degrees diagonal for a 50mm lens. For an APS-C 1.6 Crop factor lens, it is 30 degrees for the same 50 mm, (Note that it scales exactly with crop factor.) Now, if you had a FF and APS-C camera a 80mm lens on the FF would have the same image as the 50mm on the APS-C.
10. Nikon 1.5X APS-C sensors in their current lineup are actually 1.52-1.53X depending on the exact measurements of the various different sensors in different models. Some older, discontinued models in the D3x00 series are slightly smaller at 1.55-1.56X. The difference between 1.52X and 1.53X is 0.65789 percent.
The implication is that if a full-frame lens is used on a camera with an APS-C sized sensor, only the middle portion of the image circle is used and the image will appear as if it has been made by a lens with a focal length that is 1.5x longer than the actual marked length. If an APS-C format lens is used on a full-frame camera it is incapable
The rule of thumb, “expensive usually means better” doesn’t exactly ring true with full frame sensors – there are great benefits to full frame sensors but that doesn’t make them intrinsically “better” than APS C crop factor sensors. To better understand the pros and cons of full frame sensors, we have to ask: what is a full frame sensor?
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full frame vs aps c focal length
