re: the 105 Micro... you are going to really like the 105VR Micro. It is so much better than the original 105/2.8D Micro in every way. You'll still want to use MF for most of the extreme closeups, but the AFS comes in handy when using it as a conventional lens, and also for tracking movement of either your focused plane (once you have it where you want -- think about how often a slight breeze causes trouble during macro shots of flowers, for instance), but it also comes in handy in another way: you can instantly go from AF to MF by grabbing the ring. Just make sure to use the range limiter when shooting AF.
The coatings offer higher contrast when shooting against the light, and the optics are far better both at distance and at wider apertures. It's a much better lens. Except for situations where I am likely to come into contact with wildlife in the field or when I'm going to be shooting very skittish subjects extremely close, the 105VR Micro is a better overall lens than the 200 Micro.
Did I really say that? Yes, I guess I did. The 200 requires superb technique to shoot handheld unless the shutter speed is really high. The 105VR is much easier to deal with, and that frees you to do things that the 200 Micro won't let you do. The 200 Micro gives you both more working distance for closeups and can double as a medium telephoto for wildlife, but the 105VR Micro does better for general field shooting on the fly. There is a lot to be said for the ability to shoot handheld with confidence.
Originally, when shifting from the earlier 105 to the 200 my image quality went up, but there were certain things that I missed because I tried shooting handheld (the subject required it) and the shutter speed wasn't high enough for quality, or I didn't even try because there was no possibility of a handheld shot and I could not possibly get the tripod set up in time. With the 105VR Micro I can go for the handheld shots again... I just have to go back to firing off a sequence to make sure I get a clean shot.
Enough said. You're going to love it.
Ron
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Ron Reznick
http://digital-images.net