Originally posted by stevebrot Sigma's test data (when both lenses were current) indicated that the 70 was the best in their line and would be my choice unless one needs the extra working distance that the 105 might provide in which case the Pentax option might be better. BTW, be sure of whether you foresee a need to have an aperture ring.
Steve
I do still shoot film, but I don't feel the need to shoot macro on film. Too many missed shots for one thing.
I really like that SIGMA and this seems to be a great copy and under-priced, so it's hard not to just buy and sell it here later if my tastes change. that said, I kind of suspect that there might be bit more utility with the current Pentax lens. WR in general is very important to me, but not necessarily with every lens, but quick shift seems key here. With the SIGMA I would need to switch the camera from auto to MF, but with the Pentax, I could AF, but just take over with MF, which seems useful in a macro lens.
But, as I said above, I may need to either send my K5ii off for service or prioritize a new body because I've been chasing some gremlins and today I was un-operational for several hours.