Originally posted by Jennasis Any recommendations?
I have the Sigma 70/2.8 EX and it is great.
I
wrote about the Sigma 70/2.8 EX a while ago praising its virtues.
I specifically wanted a 70mm lens because I wanted to take portraits with it as well.
I think that 100mm is already too long for portraits (on APS-C).
If you want a macro lens only, then going for the equally excellent Sigma 105/2.8 EX lens or even the Sigma 180/3.5 EX would make a bit more sense because the longer the focal length, the higher the stand-off distance. In other words, the lower the focal length, the closer you have to get to the subject to achieve 1:1 magnification and some critters will be scared by you approaching.
It is hard to find a bad macro lens so there are a lot of options.
If you want a Pentax 100/2.8 macro, I'd go for the WR version.
P.S.: Can't believe you took those shots with the 55-300!