If the reflector must become a Lieberkühn set around a goal, it is theoretically possible to have the right focus in the cutting plane. The dish is then based on the object-carrying slide in viewing position. It is however good to have a little room to be able to observe in hollow objects without the mirror Lieberkühn not abut against the object gene. The focus will be about 2 mm below the cutting plane for a low target, and less for a higher goal. Consider also that in any case, it is useless to have a reflector with a diameter greater than that of the plate hole, through which comes the light. You may be led to yet why home away from the cutting plane.
To that aim to penetrate the center of the reflector, the hole should be sufficient. If the passage of the bulb is not suitable, as it will cut up with the same method.
Here are some examples of installation on the objectives of my LOMO microscope.
The Lieberkühn can remain permanently on the objectives for which they are suitable, provided that it can slide upwards to release the game required to rotate the nosepiece. The adjustable viewing position is quite clear: just slide down the reflector until the object is well illuminated in the plane of sharpness …
The constitution of the slip ring depends on many factors: size and shape of the lens, reflector shape, etc … Here are some ideas to choose according to your tools, your impatience or thoroughness:
- The adhesive gum “Patafix” immediately and indefinitely adjustable solution, perfectly functional, but very ugly …
- A strip of paper tightly around the lens, which is made of putty connection to polymerize to attach the reflector, observing during the polymerization to ensure the coaxiality and squareness. When the sealant is polymerized, there to disassemble, sand and paint.
- A small tube of PVC bonded to the periphery of the reflector, with three or six tapped holes at 120 ° for fixing and centering screw on the lens.
- With a lap obviously bore the direct reflector at the right diameter. This is what shows the photo for x10 and x20 objectives.
If what you observe in incident light is smaller than the scope provided by the microscope, you want to hide the direct light. You can simply put a small opaque pellet on a microscope slide, but you get a much better black background by installing a small tube in place of the condenser under the stage. It will be a diameter not greater than the largest field accessible to the microscope, and leveled just under the microscope slide. The bottom of the tube is closed and the interior painted black.
Furthermore a tube is mechanically suited to the axial fixation instead of the condenser, it gives a much better contrast because the light output object from the mirror Lieberkühn, even violently, can not indirectly illuminate the opaque background. The center of a deep, dark tube remains black whatever the lighting. Here’s what I tinkered it long ago for my LOMO, with a socket ring lampshades and three screws.
This DIY mirrors Lieberkühn is not very difficult, and open possibilities are immense, because the observation in incident light is much more immediate and easier than transmitted light.There is no preparation to do, everything that happens in the field of your curiosity is good to see such. Magnifications up to 200x are available, under the shape of the end of the lens: those sharp and narrow are better suited because they let more inclined rays on the object even though the front lens is very close.
If you incorporate the central tubular screen as I indicated, the incident light with Lieberkühn mirror will give you the high contrast black background that is possible in microscopy. An anecdote illustrates: When I was a child, I was offered a toy microscope like many of you, and I naively thought that since the air was full of dust and germs, I was to flush out the by shining my instrument … on the air! Well, with the system I have just described, we can see the dust in the air! When everything is set, the field is absolutely black in the absence of object. But if a dust comes to pass in the plane of sharpness, it is seen fleetingly, brightly illuminated. A great experience!
Warning, this luminous efficacy has a drawback: as reflectors focus the infrared, and if we do not take precaution was quick grilling (visibly!) What we observe. This is rarely desirable…
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