Question for the macro gurus.

[payn817]

OK, I asked this before,but didn't get a real answer (in another forum). If the "crop factor" of my camera is 1.5, and I am using a lens that reproduces at 1:4, is it so that my magnification will actually be better than 1:4. I think it figured to be only slightly less, but someone told me this wasn't so.

Second question, most of my closeup stuff is done with a 70-210 with a ratio of 1:4, will a 28mm ext. tube make enough difference to justify the $89? I really like the macro stuff, but don't want to add another lens. Here's an example of what I get from this lens now.