I have used the following Canon FD /m43 adapter with the AD 100. Using the lock /open ring on the adapter it is possible to change the aperture smoothly from the minimum to maximum.
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http://cgi.ebay.com/ws/eBayISAPI.dl...664595&ssPageName=STRK:MEWNX:IT#ht_2974wt_932
I have no connection with the company.