Gosh, they are all over the place! Why is it that Meade does not publish the full specs on their website? Their "specs" page consists of FL, AFOV and RRP, and that's it.
22mm is what I just read on a similar site, Tony,
alongside the list of features with the ER=10.4mm you have linked. I think 22mm sounds about right, with the FL=26mm having ER=19mm, and FL=40mm having ER=30mm. (these numbers are from Bintel's page:
http://www.bintel.com.au/Meade5000PL.html)