Re: Need advice regarding Watson metallurgical microscope

Kevin Cunningham wrote:

<snip>

Chris, Every thing on the microscope with a few exceptions like
heating stages must be by the frame maker. It is crucial that the
eyepieces and objectives are made by the same manufacturer and for the
same use. This is most critical for fixed tube length 'scopes and you
can't mix 160mm with 210mm, the mag. goes all to heck and back. In
the good 'ole days the assumption was that either you needed a
metallograph, a semi-conductor 'scope or a biological and never the
twain shall meet. Now things have changed, look at the Olympus web
site or the Nikon.

You lack of parfocality is a bit of a problem. If you have seperately
focusable eyetubes make sure they are set at the distance between your
eyes. If you have focusable eyepieces make sure they are about in the
middle.

Remember the real issue here is not the use but cover glass and
whether the objective is assumed to be for industry. If it is then
you have a 210mm, no cover glass. If its 160mm then its cover glass
corrected. There are reflected uses for bio, like Ploem style
fluorescence.

The sliding drawtube's scale shows 155 mm as a minimum and 210 mm as a maximum. That's with the turret attached; there's another scale for working without the turret which gives a minimum and maximum which are both 18 mm lower. Now I'm a bit confused, as 160 mm isn't the minimum setting on either scale. But the minimum is certainly closer to 160 mm than 210 mm. Any idea what this all means?

I'm pretty sure the objectives will be intended for working with a glass cover slip as these microscopes came from a school and are (or were) fitted with condensers.

Many thanks,

Chris

.

Relevant Pages

  • Re: The Cooke Triplet....Photovisual
    ... Some details on the glass, and more text than I really should send out ... fabrication of shallower spherical surfaces. ... The lens is not particularly sensitive to squaring on, ... Smaller photovisual objectives used a modification of the standard cell, ...
    (sci.astro.amateur)
  • Re: magnification 100x
    ... Taking a course in which the microscope is used extensively ... glass thickness is crucial for good resolution. ... better than a 1.5 with thick specimens. ... objectives have been above 0.17. ...
    (sci.techniques.microscopy)
  • Re: Need advice regarding Watson metallurgical microscope
    ... Do you mean that all the lenses need to be made by the same manufacturer ... eyepieces and objectives are made by the same manufacturer and for the ...
    (sci.techniques.microscopy)
  • Re: objectives/occulars for stereo zoom
    ... >> Higher mag objectives whether stereo or compound usually have higher ... >> this is the one you got right 10X eyepieces have more field number ... tons of working distance hence more much greater depth of field. ...
    (sci.techniques.microscopy)
  • Re: Using Sapphire Cover Slip with a Confocal Microscope
    ... >>sapphire cover slip, will there be problems in terms of resolution etc. ... > for 0.17mm of glass, other materials would either increase or decrease the ... Microscope objectives are not only designed with a specific coverslip ...
    (sci.techniques.microscopy)
Loading