Something to consider in this comparison is the minimum focusing distance. Although they both go down to 1:1 (filling the frame with something the size of the sensor ~ 23mm x 15mm), the 105 does it from 12 inches away whereas the 150 does it from 15 inches away.

I don't know if the difference between 12 and 15 inches will really matter, but sometimes longer focal lengths require you to be so far away that you can't control the animal (I don't think 15" is too far, however).

Also the 150 comes with a tripod foot which can be nice for tripod mountain, but can make hand holding a little more cumbersome.

Either one is a great lens and you wouldn't ever regret either decision.
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Chris Harrison
San Antonio, Texas

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