A 100 mm is always a better choice as you get more space between the camera and subject. Also a shallower depth of field helps. Most subjects in Lembeh can be covered by this lens. A diopter is useful for getting some creative images and helps with the really teeny weeny ones. I normally carry one. That said the 100 mm is also good enough to cover most. Worse case a bit of cropping is always a possibility.
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