Greetings,
 
In response to Shehan Dissanayake inquiry:
 
<A colleague of mine has a pair of spring mounted Nikon Fluor objectives
(100X
<1.3 and 40X 1.3) that are stuck in the down position. We suspect oil or
Kerbs
<buffer has seeped into the lower portion of the objective.
 
Of course,  careful use and common sense when using immersion type LM
objectives is a primary requisite,  accidents and spills can happen.  Many of
the previously mentioned remedies such as objective condoms, finger cots,
filter paper absorbers, teflon tape wraping of the inner barrel spring
mechanism and objective threads, or o-ring barrier under the objective
barrrel cover, all work nicely as preventive measures against damage
especially when working on an inverted microscope.
 
The Nikon Service Department can install an immersion media barrier as a
retrofit in any Nikon oil immersion objective that maintains factory
specifications and warranty. This service can be obtained by contacting your
local authorized sales or service representative or by sending the objective
to the below address.  The charge for this is a nominal $45.00.
 
                                            Nikon Inc.
                                            Instrument Repair Service
                                            Operations Center
                                            336 South Service Road
                                            Melville,  NY  11747
                                            Attn:  Mr. E.Sato, Service
Manager
                                            Phone: 516-845-7788    Fax:
 516-845-7622
 
Respectively,
 
Stan Schwartz
Manager Biomedical Department
1300 Walt Whitman Rd.
Melville,  NY  11747
516-547-8529   Fax:  516-547-0306
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