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  • PTSideshow
    replied
    To early in the morning and can't delete them any more
    Last edited by PTSideshow; 05-07-2009, 06:04 AM.

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  • Evan
    replied
    It takes very good optics to give a usable image at powers of about 50x or so. There are a lot of misconceptions surrounding all types of optical gear including telescopes, binoculars and microscopes. Unless you are trying to count the flagella on e-coli or something similar there isn't much reason to have more then about 50x magnification. Even then the requirements for the optical system become pretty stringent. Its because the depth of field goes down as the magnification goes up. Cheap lenses aren't achromatic which means they focus the different colours of the spectrum at different distances.

    Because the range of acceptable focus goes down as the power goes up a cheap lens will become more and more out of focus and will exhibit severe colour fringing too. Even with good optics it can be a challenge to get a good micrograph.

    I use my Nikon 4300 and simply place it to the eyepiece of my 40x stereo microscope. The image scale can be adjusted by zooming in or out with the Nikon lens.

    Here are a few examples of the sort of image quality I am able to get with the Nikon. Keep in mind that the lens in the 4300 is about as good as it gets.

    For reference the wire in this image is .001" OD


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  • JRouche
    replied
    Ok, maybe you guys can help me too. I have a Bausch and Lomb StereoZoom 7 Microscope and years ago bought a usb eyepiece hoping to see something usable. The pic is really bad. Mostly red and of poor quality.

    The last time I was using it was to count the mesh of some silkscreen mesh. No good, just a reddish blob of what I can see with my eyeball.

    And with the eye piece in there and my eyeball I can see the threads of the 300 mesh like they were 2" in diameter, I can see the scratches on the individual strands.

    Im not really knowledgeable about microscopes. But my thinking is when I pull out the eyepiece lens thats say 15x Im gonna loose that magnification when I put the USB eyepiece in its place right? So that doesnt help me much, thats where all my magnification is, the objective lens isnt all that powerful..

    So am I correct in thinking that I cant get the same image I see with my eye and the 15x eyepiece with anything available??

    Or would of these 200x usb microscopes be adaptable to my zoom scope??

    I would love to get the same picture I see with the 15x eyepiece on the computer screen.

    I see these 5meg eye piece USB arrangements now but hate to spend the couple hundred bucks for them just to be in the same spot Im in now. My usb eyepiece is a 1.5 MP.

    Any help guys??? Thanks abunch.. JR

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  • uncle pete
    replied
    I bought a "digital blue" brand for about $100 u.s. I bought it mostly for high magnification views of tool edges but found when veiwing anything over 60 x the lenses were too poor to give you good resolution. The microscope would have worked for what I bought it for but I gave it to my nephews son and bought the web cam system that was written up in Digital Machinist magazine awhile ago. It's a cheap system but will allow you to do edge finding ect. I'm still waiting for someone with far more computer skills than me to set up a program for angles,circles, gear teeth ect. You then have a dirt cheap fairly accurate system that would be close to a Optical Comparator or at least pretty good for the home shop, It would be great to grind a tool, Put it under the camera and compare your form tool shape against a accurate outline under high magnification.

    Pete

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  • Evan
    replied
    . . . with the same complaints about moving when trying to snapshot it . . .
    I expect that is why the review I posted mentions that "snapshots can be done via software".

    A plus for it is that it adheres to the Windows Driver Model (WDM) so it can be used with many different webcam programs.
    Last edited by Evan; 05-06-2009, 01:38 PM.

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  • PTSideshow
    replied
    Originally posted by Evan
    Looks the same as this one at Dealextreme.com for $46.92 US.

    http://www.dealextreme.com/details.dx/sku.11743

    According to the user review at DX the Mac is no problem.
    Check amazon for that one and a host of others there are a wider assortment of reviews most with the same complaints about moving when trying to snapshot it or adjusting the magnification.

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  • Dawai
    replied
    Mine also plugs into a telescope.

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  • Evan
    replied
    Looks the same as this one at Dealextreme.com for $46.92 US.

    http://www.dealextreme.com/details.dx/sku.11743

    According to the user review at DX the Mac is no problem.

    Pros: - works w/o drivers- solid (manual) magnification - picture decent on native, and not that bad on interpolation- fps is solid- leds can be turned off- videos can be recorded- snapshots can be done via software- drivers are hacked from logitech - mac osx users can use dinoscope software

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  • bob ward
    started a topic USB microscopes

    USB microscopes

    Does anyone have a recommendation for any of the USB microscopes currently being offered on ebay etc?
    eg http://cgi.ebay.com.au/200X-USB-Digi...3A1%7C294%3A50

    I guess that being a USB device they will work on a Mac OK, its just that in the ads they mainly refer to windows and vespa.
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