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Parfocal microscope only 1/2 the field is illuminated when i move the stage the field does not move

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Are you able to focus on the specimen? Is the problem the same if you switch to a higher magnification lens?
Could be several things, a slider half way in, a turret not clicked in to the notch, ie condenser, a filter partway in.

Posted on Jan 27, 2009

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The stage is not moving when the focussing Knobs are moved. The stage moves freely vertically. It's not attached, I'm sure it needs to be re aligned and a screw need tightening, but which screws?

Hi Faye , we will probably need more info

Does the stage move freely on its own without the course focus knobs

Can you move the stage up and down with either of the course focus knobs

Instrument details / picture would help .

Oct 07, 2015 | Microscopes

1 Answer

How to troubleshoot a microscope having uneven brightness in the observation field?

uneveness of of brightness in the optical field of view (FOV) can be caused by a number of variables, but often times is do to miss alignment of the condenser. Typically when this is the problem there the "hot" (brightess area) will be shifted to one corner or another in the FOV. There are usually some sort of adjustment screw underneath the stage that will allow you to do the alignment. It is easiest if you close down the iris on condenser and adjust the height of the condenser until you can see an octagonal shape appear, then center it in the FOV.

If the uneveness is equally the same throughout the FOV then it may have to do with the position or the height of the condenser. Generally speaking the lower the magnification, the further the condenser should be away from the slide. The condenser narrows or broadens the light allowing you to fill the entire FOV of the objective.

Depending on the quality and the level of the microscope though, you may find that no matter what you do at lower magnifications you can do very little to improve this. I see this a lot with LED models. The dispersion pattern of an LED is much more focused then a halogen, which is GREAT for higher magnification, but often times manufactures will upgrade from halogen to LED an never change the optics of th collector lens and condenser to flatten out the illumination better.

Nov 19, 2010 | Olympus Microscopes

1 Answer

My stage is no longer moving with the knobs.

With one hand push the stage down, and with the other turn the coarse adjustment down. It's a cog alignment issue. The coarse adjustment cog should be turning in order to catch the stage track.

Feb 19, 2010 | Celestron 44320 Trinocular Microscope

1 Answer

What is parfocal microscope

When you switch between objectives, you don't want to have to refocus every time. By getting a [b]microscope[/b] with objectives that are parfocal, you'll be able to move between <b>objectives<b> without much need for refocusing.

Jul 01, 2009 | National Optical MRP-3000 Binocular...

1 Answer

Only 1/2 the field is illuminated

If you have a rotating perforated diaphragm, that means the hole you want to use is blocking the light partially. Make sure your diaphragm is set correctly.

Also, you might want to check that your objective is set and aligned, that could also cause half the field being dark.

Jan 27, 2009 | Microscopes

1 Answer

Problem with MF-02 binocular microscope stage

I think your problem lies in the way the stage is limited upwards. On top of the stage, right behind it where it slides against the arm, there should be a little screw.  This screw limits the movement of the stage to a certain point upwards.  If the limit exceeds the adjustment gear and its opposing track, then the stage just goes up one notch and then it clunks down.  If you screw it down the stage is limited further down, if you screw it up it's limited a bit higher.  The point of this screw is to prevent objective and slide damage.  Try adjusting this little screw a bit further down and see if it still 'clunks' when you turn it up.  After that we may work on properly adjusting it.  If not, please post again with whatever detail you can provide to aid you with this problem further.

May 28, 2008 | Premiere Microscopes MF-02 Binocular...

2 Answers

Microscopy; Relatively large spots on unknown surface obstructing view


There is five part in microscope

1. Eye piece

2. Binocular tube


4. magnification changer or joom accembaley

5. illumination segment

Try to make it out which part is gives a effect to your vision.

as per my suggesition illumination asembely you just clean it first.

keep in touch



Dec 30, 2007 | Tasco 750 Monocular Microscope

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