Question 1

Will this work with Apple 30" cinema display?

Accepted Answer

This is from manufacturer's web site:
‡ Mounting Standards: VESA FDMI, MIS-D, 75/100, C (hole pattern = 100 x 100 mm & 75 x 75 mm); VESA FDMI, MIS-E, C (hole pattern = 200 x 100 mm); VESA FDMI, MIS-F, C (hole pattern = 200 x 200 mm). For displays that use a 400 x 200 mm, 400 x 300 mm or 400 x 400 mm hole pattern, the VESA Bracket Adaptor Kit (97-759) can be ordered separately
From apple's web site:
VESA mount adapterCompatible with VESA FDMI (MIS-D, 100, C) compliant mounting solutions. (Requires optional Cinema Display VESA Mount Adapter

Both support VESA so it should work because that the arm supports up to 30 lb and the display is 27.5 lb.

Question 2

Will mount 23" Dell?

Accepted Answer

I mounted 20" iMac, whole computer.  It is too heavy but acceptable, meaning it holds it alright but I can't manipulate it up, he computer's weight pulls it down.  Don't know much about Dell, I presume it is a monitor only.  Figure out where on Dell the Ergotron's mounting plate will go: it has to be on vertical surface.  I had to do some modifications on my iMac.  Any questions?  Don't hesitate to ask

Questions & Answers