John,
Your problem is not the mechanical tube length, but rather the parfocal
lengths of the objectives. That Leitz 10X in your photo album has a parfocal
distance of 37 mm. I suspect that your Dynazoom objectives have 35.5mm
parfocal distance. An easy way to check is to measure the length of your 100X
Dynazoom objective WITHOUT including the threads. Just up to the shoulder.
That will be very close to the parfocal distance of those objectives.

Shimming the Leitz by 1.5 mm won't have any effect on the image.
Bill


--- In Microscope@yahoogroups.com, "John Fichtl" <john1945@n...> wrote:
> Hi Bill
> I tried the 160mm 10x on my Dynazoom. No eypiece adjustments or even
swapping will get it in focus. There are only 2 ways to do it. Either raise the
slide (stage) by 1.5mm or shim the objective by 1.5mm.(extend it)
>
> John (Australia)
> ----- Original Message -----
> From: bill2penn
> To: Microscope@yahoogroups.com
> Sent: Saturday, January 31, 2004 1:35 AM
> Subject: [Microscope] 160 and 170 mm Tube length discussion
>
>
> Check out my previous post on this subject, message 7775
>
> http://groups.yahoo.com/group/Microscope/message/7775
>
> Bill
>
> > FWIW, I have uploaded a few images of a 160mm oil 100x Nikon plan
> DM
> > used on a 170mm Diavert stand. They are in the photos section in
> > the swest|100x oil folder. I don't think I see any problems with
> > the tube length "mismatch" as I think the resolution is quite good.
>
> > The photos were taken with a LOMO coolpix relay and coolpix 4500
> > camera.
> >
> > swest
>
>
>
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