A 10 mm lens is always 105 mm on FX or DX. Again, the lens itself is unchanged of course, it still does whatever it always does in both cases, but the view seen by a smaller DX sensor is simply a cropped and enlarged view, different than the wider view seen by a larger FX sensor. Crop Factor is Not even about the lens.

That makes DX show cropped size in the viewfinder (not like actual DX cameras), in that the DX frame is seen as the smaller cropped area bordered with a red box inside the full FX frame (not enlarged in viewfinder) The DX viewfinder view is very much like my last picture example above — a smaller box marked inside a larger frame.

The difference today is the digital DSLR sizes might be able to mount and use the same physical lens, and then it gets attention when we notice that the different size sensors cause a different field of view size.

For example, the FX sensor is 36 mm wide, and the Nikon DX sensor is 24 mm wide. The ratio of these two crop sizes is 36/24, which is 1.5 to 1, called Crop Factor (normally we compare sensor diagonals, but these two are the same 3:2 shape). The larger sensor (which normally captures a wider view) uses the longer lens to limit its field of view to see the same smaller size field of view that the smaller sensor sees in its frame, which is the standard meaning of equivalence. This is simply how it works.

The "equivalent" focal length is used on the other full frame sensor. THIS camera always does only exactly whatever its specific sensor and lens determines it does. Anwendung. The full frame camera uses the "Equivalent Focal Length" lens (which is the smaller crop factor times its focal length). K.I.S.S.

It is still a smaller image, but the same field of view in this case. And the APS lens will "mount" on the Full Frame body, but the big difference is that APS lens diameter coverage is smaller, and the circle diameter only covers its smaller sensor size.
Crop Factor is the numerical degree in this concept of a smaller sensor cropping the image and field of view smaller.

DX is just a smaller cropped version of the lens view, but which after enlarging 1.5x more to appear same size here, then it looks like a zoomed in view, "as if" it used a lens of 1.5x more focal length on FX. This is nothing new. Or, if both use the same focal length lens, standing in the same place, then the larger sensor simply sees a larger field of view. The smaller sensor does capture a Example: You use a 50 mm lens on a Crop Factor 1.5x camera. I dwell on it because the typical beginner questions like in the little gray box above do need a better understanding about it. A 200 mm lens on Full Frame acts like 200 mm, in comparison to 35 mm film. Since the field of view of THIS sensor is cropped smaller, it means that a full frame or 35 mm camera It also means that any image on THIS smaller sensor will require 1.5x greater enlargement to produce the same size print or view as the full frame camera. So an 80mm Hassy lens is going to give a similar angle of view to a 50mm lens when used on a 35mm full frame camera.Moving down in size from 35mm needs additional math. This is the same 105 mm lens on DX (D300), on the same tripod at same distance. It is only the "cropped view" that is different. I am emphasizing the fact the smaller DX frame has to be enlarged 1.5x more to view or print it at the same size as the FX image. And it does, they may not have to buy a new lens. For example, the specification for some compact camera's zoom lens might say:

Which seems obvious, yet it causes confusion. So, if the 1.5x larger Full Frame sensor instead uses another lens focal length 1.5x longer, then it sees the same smaller (equivalent) Field of View as the smaller sensor using the shorter lens (the green sensor case in diagram). DX would give same view as FX full frame would see if FX used the 1.5x longer lens at the same distance. The FX sensor is half again larger than DX. It measures 101mm diagonally.

So (depending on zoom value) the APS lens on a Full Frame body probably suffers extreme dark unfilled corners, simply not designed for Full Frame bodies. DX is simply a cropped smaller view of the full size FX frame, enlarged more, because the DX sensor is cropped smaller. Since these lenses were not interchanged among cameras of different film sizes, it is just something we knew, but did not worry about much. However, a larger crop factor does mean the sensor is correspondingly smaller, requiring greater enlargement to viewing size, and also is subject to more digital noise than a larger sensor. However, it does still have to enlarge the smaller image 1.5x more than full frame would. More information on the how an why of the Lens Multiplication Factor (also referred to as 'Crop Factor') can be found on WikipediaWikipedia Calculation.

Sorry we couldn't be helpful. It is about as wide as you see before moving into panoramic cameras, which I’m not covering for the purposes of crop factor comparisons. The only use or importance of this "Equivalent focal length on FX" is to compare the DX VIEW to FX VIEW. The FX view is obviously 1.5x wider than DX (more wide angle than DX).

But if the larger sensor instead used the longer 75 mm "equivalent" lens, then the meaning is that it would see the same field of view that the 1.5x cropped sensor sees with its 50 mm lens. The subject objects in the image are the same size here as in the FX image. Crop Factor is only a method of comparing field of view to that expected from a 35 mm film camera (which many of us spent decades learning). The ruler roughly shows fields of view of about 12 and 8 inches, which is roughly the 1.5x crop factor. The digital DX camera uses a smaller sensor to capture the center of the lens image, which is said to "crop" the image (edges are cut off, as shown above). The Subject size is obviously the same (again, same lens at same distance), but the frame size is not the same.

Cropping is cropping. A. This makes Full Frame lenses be larger, heavier, and more expensive, to cover the larger frame. The focal length is not changed.

But actually using the cropped sensor can provide a full count of pixels.


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