Hey guys,

Im just about to buy a macro lens for my D90 and have come across these two which are in my price range. Just wondering what every ones thoughts are on the two and which one may be better? I will be doing a lot of macro shooting of reptiles so any pros and cons of these lenses would be great or any others lenses around this price range.
I already own a sigma 150-500mm and am pleased with the results i have achieved with that lens.

Jas