I told you you were looking at the wrong lens..:+}
But they have gone down a little in price lately.
You see that Calumet one was probably the APO 645 model that went for 345.00...:+}
Snook
What I cannot believe is that the "D" model has no AF for that money..?? but Macros are hard to keep good focus if your moving or your model at all. The Canon makes a 100 macro but it's a slug. But very Sharp