Question about Swift M2251C Monocular Microscope

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Swift microscope no 634008 having problem staying in focus when switching magnification

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First, a scope of this grade will not be completely in focus as you move from one magnification to the next. But it should be close enough that you do not loose your point of interest.
Be sure you are not pressing down on the stage specimen platform as you change magnifications. It is very sensitive to pressure. Also, be sure that the coarse focus tension is tight enough that the platform is not drifting down imperceptibly as switch magnifications. Look through the scope and watch if the image goes out of focus while you are watching it. If so, you have what is called "stage drift". This is corrected by tightening the tension on the coarse focus knob.
The tension adjustment is on the coase focus shaft. It looks like a chrome ring with about 3 holes in it. There should have been a strange looking tool that came with your scope. It is used to adjust the tension. If your specimen is "drifting" out of focus, simply tighten the tension ring a little bit at a time until the specimen no longer goes out of focus. Do not get it so tight that it is not easy to operate the coarse focus knob.

Posted on Dec 25, 2010


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Why can't I see a slide out of my vivitar microscope. Can see a reflection of light but there is no image of anything other than cloud

dont know the model but it sounds like you have a problem with the light source, Is there a sub-stage condenser?. Try googling
"set up microscope lighting" If the mirror has 2 sides, concave and flat use the flat-plane side. dont point the mirror at an outside sky but rather at a lit pale coloured wall, piece of paper etc.
as a rough start try a piece of white tissue/toilet paper under the
slide and investigate full focus movement ...carefully!!
be careful the the objective stays well clear of the slide.
start with the lowest magnification first. good luck

May 16, 2015 | Science & Laboratory

2 Answers

What is the other types of microscope ? how do they differ from a compound microscope ?

Compound Microscope
  • Compound microscopes can be found in most biology and science classrooms. They are electrically operated and use light to enhance the image of a cell. They will have multiple lenses for viewing.
Dissecting Microscope
  • Dissecting microscopes are also known as stereo microscopes. They have low magnification and are also light powered. These microscopes can view objects larger than what a compound microscope is able to handle, in three dimensions.
  • A Scanning Electron Microscope uses electrons instead of light to create an image. These microscopes produce three-dimensional images with high resolution and magnification. They also have a larger depth of focus.
  • Transmission Electron Microscopes use electrons instead of light to create an image. The material prepared must be very thin. The beams of electrons that pass through it give the viewer high magnification and resolution. These give two-dimensional images.

Jul 03, 2011 | Computers & Internet

1 Answer

Can I readily remove the stage from a Micromaster I, in order to examine a larger object (eg.violin) ? And then reinstall it without damage? Thanks Sam

Yes you can. Probably the best way is to remove the whole focusing assembly, otherwise once you remove the stage, you will have the sub-stage (where the condenser is) in your way. To remove the entire focusing assembly, you will first need to remove the sub-stage. On the left hand side of the sub-stage arm you will see a tiny set screw. It should be a flat head one, and you don't need to remove it all the way, but you have to back it of a ways. Once the screw is backed off far enough, the sub-stage can be lower down to a point at which it will come off. That will expose 4 hex screws; remove those 4 screws and the entire focus assembly will come off.

That should give you enough room for a violin to fit under it, but you are still going to have issues with focusing in on it. With the focusing assembly gone, there is no way to easily adjust your focus. You will literally need to act as the focusing assembly by lifting it up, or pursing it further way. You will also run into an issue with light... there isn't going to be any, but you can use an external light source from above, like a desk lamp or better yet a flash light; something that has a focused light would be best. Ideally this would be a fiber optic light source.

If you haven't already bought a microscope yet though, I would strongly consider getting the right type of microscope for this, which is a stereo for magnification of 100x or below, or you could do it will a transmitted inverted metallurgical microscope for magnifications above 100x. Where you might be able to get the micromaster to work, it really isn't the most ideal candidate for this type of application.

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1 Answer

I have a Swift 3200 series, the 4D and 10D works 40D and 100D will not focus. any Ideas address is not my work address I will reply with business address if serious.

Since you need to use oil at 100x, there is probably a good chance that there is oil on both the 100x and 40x objective. I see this a lot in my work. Since the working distance of the 40x is so close to the slide, what often times will happen is that it will accidentally get dragged through the oil while rotating to lower magnifications. The 100x is sealed to protect it against the oil, but the 40x is not, and if the oil sits on the objective for any length of time, the objective will act like a wick of a candle and **** the oil up inside of it. At that point it is more economical to buy a new object. The same thing can happen with the 100x, but it takes much longer for it to happen. Basically the seal around the objective tip is just latex chalking, and the oil will break it down over time, thereby causing the same affect as with the 40x.

You can try to clean them. If you are lucky the oil is only on the outside surface of the objective. Try using a que-tip and isophrapoyl alcohol to clean it off.

Jan 14, 2011 | Swift M2251C Monocular Microscope

3 Answers

I picked up a Bushnell 1200 power microscope at a thrift store without a manual. when I look through the eye piece all ia see is light, nothing that is on the slide. What is the missing link? thanks

You will need to focus in on the slide. There should be 2 1" diameter knobs on either side of the stand, and just to the rear. Those knobs control the height of the stage (where you slide sits). Slowly raise or lower while looking into the eyepiece. At some point something should be see, if the microscope is working properly.

Sometimes it is easiest to start with the lowest magnification. On the outside of the objective (little lenses hanging down that can be rotated) there should be some numbers written on them (usually 4, 10, 40). Those numbers reference your magnification. If you multiply that number by the eyepiece (10) magnification, you will get your total magnification, so start out with your 4x. It will give you the largest field of view, so it is great for finding whatever it is that you are looking for on your slide. It is also the easiest one to get focused. The higher you go in magnification, the smaller the field of view, thereby the more difficult it is focus in on your sample.

Dec 19, 2010 | Tasco 750 Monocular Microscope

1 Answer

The stage slides down on its own and the view gets out of focus.

Just inside the coarse focus knob you will see a "chrome" ring with holes it it. That ring needs to be tightened just a bit. It will make the coarse focus knob stiffer so tighten only enough to stop the downward drift of the stage. A funny looking tool should have come with the scope. It is used to adjust this "tension" ring.

Oct 22, 2010 | Swift M2251C Monocular Microscope

1 Answer

Why should the coarse focusing knob not be used when focusing with the higher-powered objective lenses

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.

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1 Answer

Stage slides down after focusing

There is a tension adjustment for this. It is located on the coarse focus knob which is on the same side as the switch. It looks like a chrome ring with about 3 holes in it. A strange looking tool should have come with the scope. It is designed to fit into these holes and allow you to adjust the tension on the coarse focus knob. You need to tighten it just a little bit. Not too much or you will have trouble operating the coarse focus knobs smoothly.

Jul 08, 2010 | Swift M2251C Monocular Microscope

1 Answer

Manual MP120 swift microscope

Here is the email address of Swift Microscopes -
I have placed a request for the microscope manual. Let's find out.

Apr 19, 2010 | Science & Laboratory

1 Answer

Parfocal microscope

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.

Jan 27, 2009 | Science & Laboratory

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