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Just aquired an old olympus
Olympus makes good microscopes so you have done well and stereo microscopes are so much nicer to use than singles. As far as cleaning the lenses goes, buy a good quality camera lens blower brush and also a can of compressed air like the ones used for computers. Blow any loose dust hairs etc off with the can of air and then use the brush for anything remaining. If there are fingerprints or grease on the lenses then clean them using camera lens cleaning fluid and lens tissue but make sure all debris and dust are removed first or you may scratch the lenses. In general try not to use anything more than air and a brush unless absolutely necessary. Another option for removing fingerprints etc is to use a "lens pen" with caution. The ones sold for cameras work well but may be too large. They make some smaller ones for cleaning camera sensors and those might work better for the relatively small microscope lenses or just cut the regular lens pen disk to make it smaller. It is just as important to make sure the lens is dust/debris free when using the lens pens.
Low power stereo microscopes often allow you to put on a single magnifier lens in front of the main objectives to increase magnification. Do a bit of searching to find what are options for your model.
on Jan 18, 2018
The off/on switch on my 1973 olympus khc has
You could try to dismantle the microscope to access the switch and try to service the switch, or replace it. It's probably stuck in place because of grime. Dismantle it, clean it out with isopropyl alcohol, make sure it moves, then wait until it dries out and test it.
It can be easily replaced with a simple switch bought at any hardware store. An electrician could easily do it for you, or if you know electrical hardware, you can do it yourself.
on May 19, 2013
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