After rereading the previous reply I used the word "standard" were I
should have said "common" because there areothers like the 1088 etc.
I posted a picture showing the main difference in the mounting
configuration. Look under "AO condenser differences.

--- In Microscope@yahoogroups.com, "Ted Coffey" <twcoffey@...> wrote:
>
> The standard condenser for the 10/20 series is Cat no. 1084 which a
> slot on the body which pivots for alignment on a pin at the rear of
> the fork.
> The standard condenser for the 110/120 series is cat no. 1087 which
> has a pin on the condenser body which engages a slot at the rear of
> the fork.
> A 110/120 scope can use the 1084 condenser without the pivot point but
> it is a little more difficult to align. The 10/20 scope can not use
> the 1087 condenser because the pin on the body interferes with the pin
> on the fork.
> Of course, if one is capable a little modification in the machine shop
> could make either condenser/fork arrangement to work on either scope
> series.
> These two condensers replaced the flip top. The 1084 and 1087 come
> with a swing out lens for low power(4X) objectives which accomplishes
> the same thing.
> The phase condensers have similar differences.
> I have no answers for your other questions concerning the stop
> carriers on older scopes.
>
>
> --- In Microscope@yahoogroups.com, "blekenbleu" <blekenbleu@> wrote:
> >
> > Actually, I would probably find other condensers confusing,
> > but I have read enough about AOs to be thoroughly confused.
> >
> > The AO Series One-Twenty Reference Manual states that
> > all were provided with a flip-top condenser and mount.
> > The fork mount for that flip-top condenser differs from forks seen
> > on two AO 10s, although the AO 120 fork+dovetail rack can be
> > swapped with those from a Series 10.
> > (The AO 120 fork+dovetail rack is basically one piece;
> > AO 10s have separate forks fastened to racks by 2 screws.)
> >
> > At
> >
>
http://www.xmission.com/~psneeley/Personal/Microoddsandends.htm#Condenser_Fork_M\
ount_Changes
> >
> > "...The series 15/35, series 2/4 and series 10/20/110/120
> > all seem to use the same fork."
> >
> > I have seen a number of ebay listings for non-fliptop condensers
> > described as fitting AO 110+120, but not AO 10+20, so it seems
> > that AO 110+120 share forks, if not standard condensers.
> > Wallace Kelly confirmed that "condensers for the AO Series
> > 10 and 110 are not interchangeable as the forks are different."
> > in message 2698.
> >
> > However, at least some AO condenser lenses thread into what
> > are called "condenser mount" in AO catalogs
> > or "stop carriers" at micrographia.com,
> > which get secured in dovetail rings by set screws.
> > Three AO mounts measured 37mm OD;
> > another condenser mount of unknown manufacture measured 39mm.
> >
> > I have seen other "stop carriers" with different diameters
> > and non-circular dovetail fork mounts.
> > Is there a listing of condenser lens threads dimensions
> > and "stop carrier" diameters
> > employed by various AO microscopes?
> >
> > What about for other makes and models?
> >
>