The main advantage of a 200mm over a 85mm is that you have a greater "working distance" (distance between subject and front of the lens). Skittish subjects tend to object and buzz off when the front element of your lens is pushed into their face. The minimum working distance for a 200mm is about 10 inches as opposed to 4 inches for a 85mm. Another problem with being too close is getting light on the subject as the lens and camera body tends to shade the subject.
The 100mm or 150mm lens are a good compromise on working distance and price. Prime macro lens by design tend to be stellar or mega stellar.
The Sigma 105mm and 150mm gets a good rating by many users.
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Rob
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Last edited by robski; 15-11-09 at 11:13.
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