Many people use AF for macro, it's very useful for butterflies, lizards, amphibians and snakes. For dead subjects (or even flowers in field) on table using MF with focus rails for stacking is appropriate but using rails and tripod in field in harsh conditions is slow and a sure shot method to miss the moment. For both these photos I relied on AF of 100mm L and both were shot during Monsoons in western ghats in forest filled with fog(technically they were clouds that bring monsoon rains with 100% humidity).
Nyctibatrachus petraeus (3) by Chaitanya Shukla, on Flickr
IMG_9039 by Chaitanya Shukla, on Flickr
And the first one shows a fair amount of camera movement.
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