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Author Topic: Help with an American Optical Stereo Star AO 580 Stereo Microscope?  (Read 605 times)
Brett_H
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« on: June 20, 2011, 09:09:25 AM »

Hello to all, I thank you in advance for any help you are able to give me. I use
stereo microscopes to inspect and work on laptop motherboards. I recently
purchased this microscope from eBay:

http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&_trksid=p4340.l2557&rt=nc&nma=true\
&item=200604710291&si=%252Bg5HRAfHnveryGdMyUgeCscTrXQ%253D&viewitem=&sspagename=\
STRK%3AMEWNX%3AIT

This came with 15x WF lenses and a coarse adjustment from 1 - 6. It has a camera
and "internal" light source attachments from the factory. I purchased this to
replace my Bausch & Lomb Stereo Zoom 4. The B & L has 10x WF lenses. The view on
the AO 580 is very dim at best, but clear, under the same lighting as the B & L,
through out all coarse ranges.

What is not advertised in the eBay listing is that this has an internal
"turret" of 5 filters for the incorporated illumination, one of the filters
being red. Changing filters has no effect when using an external light source.
To date I have not used nor purchased the light source for the internal
illumination. I have only used an external light source. Again the view is very
dim.

I have inquired to several places selling similar, if not the same microscope.
They all say the one they are selling works fine with only an external light
source. What am I missing, if anything? What could be wrong with this? Is it
worth having or fixing? Is it possibly a specialized microscope that is meant to
have a dim view for some reason?

Please forgive my lack of proper technical wording insofar as microscopes go.
Again I thank you for any help or advice you are able to give.
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fizixx
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« Reply #1 on: June 20, 2011, 09:46:16 PM »

It's really hard to try and troubleshoot something like this over the web. Even trying to explain the design of light sources and how/where the images come from would be difficult.

I'm also not 100% sure I understand exactly what the circumstances are with the dim vs. clear image/lighting.

I couldn't tell you if it's worth fixing without seeing it......you always take a chance on ebay. There are instrumentation places that buy/sell used scientific equipment.

The website below MAY be of some help, but you probably have something wrong internally. Did you say you have a different make light source than the make of the microscope itself? If so, then the differences between the two is probably the problem....huge guess on my part tho. Everything with optical instruments has to be aligned very precisely to work properly.

It's also not clear to me if you do, or do not want to use the filters, or if you suspect them as the problem......which maybe they are. Again....I'd have to see what's going on, and what you said is detailed and good....just not enough detail for me (sorry).

Usually getting something repaired costs more than what you paid for the original item. Unless you know of someone that has the tools and skill to look at this you may have to try another route.

I don't think I can offer you much more assistance than this. Good luck tho.....hope you can figure something out.
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David_D
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« Reply #2 on: June 20, 2011, 10:06:50 PM »

Check the optics to see if there is crud on some of the optics...

Use the 10X B&L eyepieces and see how they work...
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Bob_D
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« Reply #3 on: June 20, 2011, 10:35:06 PM »

I have some experience with the light compound microscope, and it sounds to me that you are not seeing the primary image of what is on the microscope stage.  In other words, there may be an alignment problem with the internal turret.  There must be a prism inside the microscope body that splits the image up so that it appears as one image at the stereo eyepieces.  The dim image that you are able to see may be just a secondary reflection off the Internal glass prism.  Maybe there is a mechanical switch some place for switching between an internal light source and an external one. If so, that might be your problem. If not, then my guess is that there's an internal misalignment issue.

I would suggest taking a small flashlight, or just a small bulb connected to a battery, and place it under the objective lens, moving it around on the microscope stage and see what results.  But it does sound like an alignment issue.

Hope that you can get it working.  Looks like a pretty good scope for the money.
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