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Considerations for using a FF lens on MFT?
I am wondering about the workability of using FF lenses, such as those designed for the Nikon F mount, on a Micro Four Thirds (MFT) body using an adapter.
One obvious consideration is that an adapted lens needs to have an aperture ring, since there will be no electronic aperture control. Also, there will be no auto-focus, obviously.
So, given these constraints let's imagine trying a lens like the Sigma 70mm F/2.8 macro. This lens is renowned for sharpness. So, if we mount it on an MFT will it be even more sharp and distortion free because we are only using the center of the glass? Will this extra sharpness be noticeable? I guess it is hard to know without having a distortion map of the Sigma and seeing whether the image circle in inside of the distortion wave of the lens, or just getting the lens and shooting a grid with it. However, I would like avoid buying the lens if it is not going to work and rentals are a hassle.
An additional caveat is that the field of view wi