I've got a question regarding focal length conversion of lens to/from APS-C sensors: Full frame lens to APS-C: 1.5(ish) X focal length. I get that since we're taking a larger area, and cropping it down by (theoretically) making the focal length of the lens longer, to bring down to the smaller sensor size of APS-C cameras
So 35mm APS-C lens, 35mm MFT lens, and 35mm full-frame lens would all produce the same level of magnification on the same camera. (Not necessarily same FOV because the sizes of the imaging circles are different.) Lenses that are permanently coupled to a sensor often (always?) report the 35mm equivalent focal length.

Focal length is a physical property of a lens, so a full frame lens on an APS-C body will look the same as an APS-C lens of the same focal length. I think this is half-true in that one of the reasons I have been attracted to APS-C lenses for my APS-C cameras even when there's full frame equivalents, is that the crop format lenses tend to be

Full-frame Sensors Have a Wider Dynamic Range than APS-C. The Shallow Depth of Field of Full-frame Sensors can Help or Hurt a Photographer. APS-C Cameras Are Subject to the Crop Factor Effect. Full-frame Cameras and APS-C Cameras Differ in Size. Full-frame Cameras Are More Expensive than APS-C Cameras.

For example, a full-frame sensor is 1.6 times bigger than an APS-C sensor. A 50mm lens used on an APS-C camera would be like looking through an 80mm lens on a full-frame camera. (Note: Canon and Sony APS-C sensors have a “crop factor” of 1.6x. Sony APS-C sensors are a slightly different size and have a crop factor of 1.5x.
A: Finding the Full Frame Equivalent of Your Lens. This visualization is to help you understand what 35mm equivalent focal lengths you are actually getting out of your lenses depending on the camera that you put them on. For example, a 28mm lens with a 1.3x crop factor, has an effective field of view of a full frame lens equal to 35mm. On a full-frame camera this is 43mm – and so typically a 50mm is regarded as a standard lens for full-frame purposes. On an APS-C camera it is around 27mm (43mm divided by 1.6). These are the benchmarks for identifying lens types. A focal length greater than the standard is telephoto and a focal length less than the standard is wide-angle. Full-frame vs APS-C – imbalanced scales. In doing so, there is a crop which effectively extends the focal length by 1.6x (for Sony and Nikon it’s 1.5x).
Focal length spreads it out, but for the same physical aperture diameter, the same amount of light is collected from an object in the scene. In the case of crop vs full frame, a common measurement is to change the lens to maintain the field of view, e.g. 50 mm f4 on 1.6x crop aps-c, and 80 mm for full frame.
50mm lenses on APS-C cameras. If you use a 50mm lens on an APS-C camera then the crop factor of the camera means the 50mm lens is a short telephoto. Combined with the wide aperture of the lens this makes a 50mm lens ideal for portraits on an APS-C camera. Some photographers own both full-frame and APS-C cameras that share the same lens mount.
Try comparing a 3-frame pano from a FF camera against what the same camera does with a single frame with both images framed to equivalent focal length. The pano somehow has more "presence". .
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    • full frame vs aps c focal length