I want to buy an adapted macro lens, as I find the Oly 60mm macro to be too short (I used to have the 50mm macro, but only used it with the EC-20 TC), and doing macros is mostly MF anyway. So I'm looking for a macro that would be 100mm or longer. Since these long macros have to be shot at minimum f/8 or f/11, I'm wondering how these lenses play with flash. I have the rather large Olympus FL-36R. Does it expose correctly on auto or would I have to set the flash manually? I'm looking for the sharpest lens you can find under $500. Which long macro lenses would you recommend? I have been looking at the Canon FDs.