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For your purpose, these IR systems which simply maintain the coverslip at a fixed distance from the objective are not what you need, and they were never intended for that purpose.  What you need is an image analysis system which will search for and find focus (just as a compact digital camera will).  I know that SIS (now owned by Olympus) will do this, and I'm sure that most other commercial systems will.  There may even be some free systems out there.

                                                               Guy

-----Original Message-----
From: Confocal Microscopy List [mailto:[log in to unmask]] On Behalf Of Pascal Weber
Sent: Thursday, 7 March 2013 7:33 PM
To: [log in to unmask]
Subject: Automatic focus

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Confocal not matter.

I am looking for a microscope that can do focus on slides with bacteria without 
any intervention. I would like to use a XY plate with 8 slides, objectiv 40X dry. 
Does anyone have an idea? I try IR automatic focus ( Leica, Nikon, Zeiss) but 
anyone works correctly.  thank you