I thought about getting one of these But, BIG BUT,
It is an old design (about 1995) non stabilised and it seems is only able to utilise the more central focusing points in a FF camera like a 5DIII. This latter seems odd but presumably relates to optical design of the lens. Now in macro focus is critical, and if one is to use AF it will often not be at the centre of the image but on a third for example, and the last one wants to do is focus and the recompose.
What have other members of the forum found? Would I be better off buying a sigma equivalent with stabilisation and a more modern design? Would this be better operationally? Should I wait for a Canon redesign at greatly increased cost for the lens? I already have the 100mm macro so its the extra distance I am looking for.
Opinions welcomed especially those who have used these lenses.