I have the older version of the Nikkor 105mm lens. I've read that the newer version focuses faster and hunts less in low light. I do have a focus light but there are situations where it is not usable (e.g. shooting pygmy seahorses).
Having recently upgraded from a D7000 to the D7100, which has a better focus system, I'm wondering if there would be any noticeable difference in how these two lenses perform on the D7100. Simply put, I'm wondering whether it is worth the upgrade to the newer version 105mm.
Thanks for any input!