How much extension did you had to add to that macro lens ? You also focused the macro as close as possible, right ? Were you able to shoot at f11-f22 without vignetting ? Does the extension that you add have more effect than the built-in extension or it is the same thing ? Is the rear element on the FA 100/2.8 fixed or it moves depending on the focus ? I see that the built-in extension on my lens has very little difference in regard to vignetting so I am afraid that I would have to add to much extension tubes which would be unmanageable. Is there any automatic extension tubes that would pass the electrical contacts as well as aperture control so I can keep P-TTL.
> The recessed front element is no problem. I have used the FA 100/2.8 > macro, which also has a recessed front element. No problems at all. > Don't know if it gives any benefits, though. > > The only good way to deal with vignetting is by extension tubes or > bellows. You will always get vignetting with wide-angle lenses. I > paired the 100mm with an FA*24/2 which has a larger front element than > the 100mm, but still got vignetting.
