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Vignetting issues with canon 5d and canon FD 100mm marco with FD adaptor


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With the length of the adapter, without a lens, the combination would focus very close.

 

So, the adapter has a lens which compensates, and this also expands the image to fill the frame.

 

I presume, then, that there is a hole (where the lens was) much smaller than the frame size.

You need to remove enough of that.

-- glen

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