Dave,
>From an old lens catalogue...
The A2X-S works with everything from the A16/2.8 FE to the F600/4 (but
not the FA600/4).  Also good for A600/5.6, P1000/8, P1000/11, most
zooms and all the Macros.
The A1.4X-S works with A16/2.8 FE thru F300/4.5 (but not FA300/4.5).
Also most zooms and all the Macros (except the A200/4Macro).

The A2X-L and A1.4X-L have long snouts and will only fit in the
following lenses.  A300/2.8 both fit
A400/2.8 both fit
A400/5.6 - A1.4X-L doesn't fit, A2X-L does
A500/4.5 both fit
F600/4 both fit
FA600/4 both fit
A600/5.6 both fit
P1000/8 both fit
A1200/8 both fit
A200/4 macro - both fit
A85/2.2 soft focus - both fit
I think the beginning of the list is the key to the L converters.
They are for the big glass - 300-600mm and f2.8!  They fit in a few
other lenses, but do not offer better performance with them.
Regards, Bob S.

On 10/28/07, Paul Stenquist <[EMAIL PROTECTED]> wrote:
> Yes, the A2X-S works fine with the 400/5.6. And some lenses shorter
> than 400, like the 300/2.8, work better with the A2X-L. Boz isn't
> quite right about that. Somewhere there's a list of which lenses
> should be used with which converter, maybe on the Pentax USA web
> site. In any case, all the 400/5.6 lenses are meant to be used with
> the A2X-S. The A2X-L has a long snout that interferes with the rear
> baffling and element in these lenses. I know. I tried one. It doesn't
> fit.
> Paul
> On Oct 28, 2007, at 8:12 AM, David J Brooks wrote:
>
> > Paul, i was just looking at Boz's site and he has a comment for the
> > A2X-S converter that it was to be used for lenses up to 300.
> >
> > Is that a typo do you think.
> >
> > Would it work with a K lens like the 400
> >
> > Dave
> >
> > On 10/26/07, [EMAIL PROTECTED] <[EMAIL PROTECTED]> wrote:
> >> The Halloween precursor full moon crept in  last night, and I
> >> celebrated with a wee bit of scotch. So I had to try to see if I
> >> could get a decent pic with my bargain big glass: the A400/5.6
> >> plus the A2X-S converter. There was some water vapor in the air,
> >> so I think I can top this on a perfect night. But this shot is
> >> better than the moon I sold through the stock house a couple years
> >> ago.  Not as good, of course, as the one Ken shot with his gimble
> >> mount and FA 600/4. But it comes at less than a tenth of the
> >> price. By the way, after shooting, I did a bit of barking and
> >> danced naked in the backyard. The neighbors appreciated that.
> >> Anyway, here's the moon:
> >> http://photo.net/photodb/photo?photo_id=6569744&size=lg
> >>
> >> --
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> >
> > --
> > Equine Photography
> > www.caughtinmotion.com
> > http://brooksinthecountry.blogspot.com/
> > Ontario Canada
> >
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