My 7th graders spin the lenses on the microscopes when I'm not watching. The result is a loose lens holder (that round thing that holds the three lenses) which makes the microscope unuseable. How do I tighten it back up? Thanks, Carl
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Re: Loose Lens Holder
I seem unable to get a user or service manual online, however at a guess I would think that the retaining mechanism is inside the "head" of this beastie, so in order to access you would need to undo the screw that retains the viewing piece, this should give you access to the internals, however you have to be vary carefull that you do not contaminate the microscope.
it may be easier to send it to be "cleaned" and hopefully when it returns it will have been tightened up.
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Hello, Have you tried putting something under the microscope and then trying to focus on it?Maybe the lens is out of focus. See if there's nothing obstructing the lens. If problem persists after trying those two things you should probably send it to warranty as there most likely is a bad connection between the lcd and the camera. Hope you can fix it easily.Best regards Vlad
Field of view and working distance vs magnification is a law of physics. Using the lowest power gives you the widest field of view and greatest working distance but the trade of is that you loose magnification. Conversely as you increase magnification you decrease working distance and you loose field of view diameter.
The optics of your microscope are limited to .4x to 2.5x magnification. Your working distance is limited to 200 - 400mm depending on the magnification you are using.
I am not aware of any interchangeable lenses for this scope.
You can send the lens to Delta Optical Instruments, Inc.They can determine if your EF Plan 40x objective lens is repairable.The will give you an estimate prior to work or suggest a replacement if it cannot be repaired.email them at: email@example.com
The knob you are talking about is called the x-axis control knob. It does not directly affect the focus. What affects the focus is the slight manipulation of the stage and or slide while you are adjusting the x-axis control knob. It only takes the slightest pressure to throw the focus off very far. Theoretically you could completely remove the specimen holder and move the slide around with your fingers.
The specimen holder may need to be replaced but without further more detailed knowledge of the mechanical problem I cannot instruct further.
There are two reasons. One reason is that when on high power you are working so close to the glass slide that it is easy to misjudge how much you are moving the specimen toward the lens that you can break a slide before you realize it. The coarse focus moves the stage with the specimen on it very fast and you only have a very very short distance within the focus plane before you run the objective lens into the slide.
Secondly, it is just harder to control the minute adjustments needed at the higher powers with the "coarse" focus knob. If you start at the low magnifications find what you want to concentrate on with the coarse focus knobs and then work your way up to the higher powers, you will have very little trouble moving to the fine focus controls at 40x and 100x while still having control of your image.
If your stage is still in its correct orientation then make sure your objective lenses are screwed in tight as well as the eye piece being secured correctly. Try using different objectives (don't go too high or you may damage your lenses if you ram it into your specimen) and using the fine and course focus. If the you still cant focus using different objectives it's quite possible that your mirrors or lenses inside the microscope have been knocked loose. I would then recommend only having it repaired by a certified microscope technician. If it is still under warranty take it back to the store of purchase or send it back to the manufacturer.
The Nikon Optiphot 2 tube length is 160 mm DIN finite. It is a 1990 vintage microscope. Any objective lens with the standard RMS thread, -160 engraved on it will work. It will not work with other brnads with the infinity symbol engraved on it or infinity tube length Nikon 200 mm, CFI60 objectives for 2000 vintage to present microscopes. - Lawsen Lew
sir,your microscope tube with the eye piece is screw joint with microscope body. Rather part is friction fitted as well as there is a proper place to mount it.you can do the gluing but first of all be clear that part should be not a movebale part other wise you will have dificulty for fine focusing.
for the further quotation dont be hazitate,