Re: Embarrassing question

On Sep 21, 10:58 am, UKoncology <UKOncol...@xxxxxxx> wrote:
On 21 Sep, 14:03, Kevin Cunningham <sms...@xxxxxxxxxxxxxx> wrote:



On Sep 21, 7:42 am, UKoncology <UKOncol...@xxxxxxx> wrote:

I really ought to know the answers to these questions....
I wish to get a better low power lens for my Leitz 160mm tl stand
(<x8)
Will a 10mm spacer between objective and stand improve the optical
performance of a 170mm objective in this configuration?

Are infinity corrected objectives interchangeable between infinity
corrected stands of different manufacturers?

Has anyone tried making a relay lens to fit in the optical path to
allow infinity corrected objectives to be used on 160/170mm stands?

Thanks, hj

Cool questions!  The E. Leitz 170mm objectives were actually 162mm.
Thats just for fun.  If you have a Leitz 160/170 you should use Leitz
160/170mm objectives.  At low powers there is a slight bit of
parfocality difference but not too much.

There is no real way to use infinity objectives on a finite 'scope.
First of all Leica and Nikon use a very different thread on their
infinity objectives than on their fixed focal length lenses.  This is
to prevent putting finite lenses on an infinity 'scope.  There are
huge back focal differences between makers, for instance Olympus can
have two intermediate pieces and Nikon can have more.

Theoretically you can take any objective and make it into just about
anything optical but in reality it costs tons and tons of dollars
more.  If you want a high performing 'scope, buy an infinity corrected
'scope built in the last two years.  Don't put a trinocular on it,
just a camera with a real time feature.  In the not to far distant
future all viewing will be on a digital monitor.

Thanks,

Kevin Cunningham
SMS

Thanks for your help, Kevin, your experienced and informed answers are
invaluable.
I hope, however, that you are wrong about digital monitors - I've
never seen one that comes close to expensive glass in terms of image
detail and quality. Pathologists have been exploring this for years,
with limited success, but I've never met one who prefers a monitor to
modern optics! Mind you, if you are correct the secondhand market in
nice, not quite so expensive glass might cheer up a bit.
best wishes and thanks, Hugo Johnson

You might want to keep your eye's peeled for the new generation of
hematology equipment. Sysmex has a device as a part of their
automated hematology system that gives startlingly good images of each
hematology slide. These are reviewed by the hematology staff, usually
those images are much better than what they see on their abused
microscopes. I've seen it and I'm impressed. It's based around an
Olympus BX-41.

Thanks,

Kevin Cunningham
SMS
.

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