Electronics > Beginners
Issues with my first microscope
grizewald:
If you don't have bad eyesight, the adjustment for both eyepieces should be the same.
Here is how much I have to adjust mine:
Are both eyepieces the same? Mine are both Wide Field 10X/20mm
grizewald:
If you swap the positions of the eyepieces, does the problem move with the eyepiece?
Have you checked to make sure that the objective lenses on the bottom of the microscope head are both screwed in properly?
Psi:
--- Quote from: Kfire778 on April 03, 2019, 01:22:57 am ---When doing the parfocial adjustment, I dial everything in using just one eye, and when I have a clear image in it, make the diopter adjustments to the second eye piece, but that is when my issues start.
--- End quote ---
Rotate the focus on each of the two objective eyepieces to center position. (Move them all the way in either direction so you can figure out their full rotation range and where the center point is)
Look through the microscope
Adjust the diopter to align the 2 images into one by moving the two eyepiece stalks inwards/outwards.
Close one eye (lets say right) and adjust the microscopes main focus adjustment knob until you have the left eye image in focus.
Now close the left eye and look with your right eye only.
Rotate the right eyepiece objective focus adjustment until the right eye image is in focus.
Now open both eyes and it both should be in focus and one signal image.
If something still is not right try adjusting both the objective eyepieces focus adjustments together and in the same direction by the same amount.
Note1: The diopter adjustment for each eye stalk should be linked internally by some gears. If you move the right eye stalk inwards it should move the left eye stalk inwards, and vice versa.
If it does not do this then you will need to do it yourself manually. They're positions should be a mirror image of the other.
Note2: If you focus zoomed out and then zoom in this will almost always go out of focus, even with parfocial correct.
This is because you cannot get perfect focus adjustment on a zoomed out image. There will be some small error that will become huge when zoomed in and make it out of focus.
But if you focus while zoomed in then it should be in focus for all zoom levels when parfocial is correct.
Kfire778:
Just as soon as I get off work I will check all of these things and get back to everyone.
jfiresto:
Thanks, guys, for the pictures of the microscope. It appears to be a Greenough design with a fixed tube length. I may have to keep quiet as the microscopes I know best are Common Main Objective with infinity optics. I do have a Greenough, but it is a nearly indestructable student model that discourages students from taking it apart. Which is probably good, as back then I would have, to see how it works. :)
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