The 40mm f/2 lens will however behave on APS-C camera like a 60mm f/3 lens would on a full frame camera when it comes to the output (e.g. JPG). This means that the photos taken at 40mm f/2 on APS-C and 60mm f/3 on FF are in principle identical if the other exposure parameters (i.e. exposure time and scene luminance) are identical.
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Think about what APS-C mode is used for: it's used for lenses which project a smaller image circle. Those lenses are designed to illuminate an APS-C sensor which is half the size of a full frame sensor. In APS-C mode, on an A7R5 or any other full frame camera, only the APS-C part (inner part) of the sensor is used.
There are lenses in both APS-C and FF having good bokeh. But usually the best FF lenses are better than best APS-C lenses also in bokeh, much easier to design also. Bokeh is also somewhat personal subjective. But usually most prefer full circular bokeh balls edge to edge with smooth rendering inside.
For Micro Four Thirds lenses, that would mean: Panasonic-Leica 25mm f1.4 would be equivalent to 50mm f1.4 on full frame, f2.8 equivalence in Depth of Field (DoF). Panasonic-Leica 42.5mm f1.2 would be equivalent to 85mm f1.2 on full frame, f2.4 equivalence in Depth of Field.
Using lenses for medium format on a full frame DSLR provides a crop factor of over 2X. Using these lenses on an APS-C sensor provides a crop factor of over 3.4X. In terms of what was discussed earlier, a 6×7 lens on a full frame DSLR over fills the sensor area by more than 2 times. It over fills an APS-C sensor by 3.4 times.
I'm gonna get the aps-c 18-50mm f2.8 sigma and this is an aps-c lens so does that mean that the pictures that will be taken will look like full-frame 25-75mm? On a Canon APS-C body, the 18-50mm will give an angle of view roughly equivalent to that of a 29-80mm lens on a full-frame camera (due to 1.6x crop) dANnx.
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    • full frame to aps c lens conversion