I wish to brush with negative clarity in ACR. I have been told that when doing this in Lightroom one can change the amount and get negative clarity of
-200 (using the amount slider) In ACR the maximum negative adjustment seems to be -100. Is there some adjustment I don't know about where one can extend this as in Lightroom. If I create another brush and paint over with negative clarity a second time would this be doing the same thing?
In LR 3.2, which uses ACR, the negative clarity is also -100. It might have been -200 sometime in the past but no longer. Also, you can add as many negative clarity brushes as you would like, the effect is cumulative but not necessarily what you expect
Additional brush strokes (with negative values) will indeed increase the "negative clarity" effect -- i.e., make it stronger.