get the pentax 100mm WR, the non WR is disgustingly ugly, not that it'd not a good performer, it just looks like something i'd only ever use in secret
the sigma 70mm and the tamron 90mm are ridiculously sharp, the sigma 105mm is not as sharp
70mm is not as short as you'd think tbh- if you keep still and let the animals get used to your presence you can get very close without spooking them
think about whether 70mm or 100mm is a more useful focal length for you
my personal macro kit consists of a 2x macro teleconverter and a 50mm and 28mm lens- I use the former for flying insects and the latter for when I want to take really close photos of like, a spiders knee or something. I use the onboard flash with a home made diffuser. Flash is absolutely essential- shooting at f11 there is no way you can get enough light, even if daylight- i'm planning on adding an external flash so I can shoot at a lower ISO- I have to use 800+ to get correct exposure, and on an ist DL that isn't pretty
p.s. all the above cost me less than £100
Last edited by clark; 07-26-2010 at 05:55 PM.