Product looks very stylish; installation is a breeze (I have Windows XP); operation is very intuitive and smooth. All good, except magnification seems to be stuck at 20X.
I tried all moveable parts on this camera; and adjusted the magnification scale in "preference"; but the magnification never changed. Since high magnifying power is the main feature I'm after, this product gets a one-star from me. I hope I made a mistake; if so, somebody please tell me how to increase the magnification.
The box and User Instruction gives no contact number -- not even the company selling or manufacturing this product which is pretty weird. I only found company name in the Amazon shipping label. I'm gonna call them on Monday but somehow I have a feeling I'd get nowhere. GSI High-Definition Scientific Digital LED Microscope, USB Video Connection to Computers/Laptops/Notebooks, Magnifies All Microscopic Articles 200x, Special Image Treatment, Includes Stand for Handsfree Use, for Hobby/Science/Education/Industrial
Bought this for my classroom use with some special education kids. They loved it and it worked well. The software that comes with it leave A LOT to be desire. Very limited in scope and functionality. It was also somewhat annoying that there is an increasing lag in the computer image as you increase the resolution (zooming in more on the image.) You move the scope, or change the focus, and there is a serious lag in what you see on the screen at these higher resolutions. It makes focusing very difficult at high resolutions. Not a problem at the lower settings.
The snapshot feature is nice.
I could not get the unit to work on my computer with Windows 7. There are toggles within Windows 7 to revert back to previous versions (Vista, XP etc.) to make older products work. Even with the computer operating a version the GSI required; it would not work.
There was no support or anyone to call. Even the package has some broken English a.k.a. mis-spelled words.
This unit is easy to set up and use, great for kids.
The issue is the magnification is no where near 200x.
It is not useful for me and I ended up giving it away
to my neighbor's kids. They are very happy with it.
I will be trying to locate a different brand that
actually works as stated.
I bought this microscope a couple of days ago. There is absolutely no support, no site, no drivers. The CD provided is in half format and impossible to use in a side-slot drive. The instruction manual has no reference to the company that manufactured the product. I would not recommend this to anyone! I can't speak for the quality of the product, since I have not been able to see anything of it's performance, a black screen does not tell me much! Selling a usb camera with no drivers and support is actually ridiculous!
Like most here, I was very unhappy with this microscope. However, once I found the below I have done a complete 180. My only beef that remains is that it is not as solidly built as i want, nut it was also half the price of other microscopes that accomplish the exact same thing. I hope this helps!
"I just bought this microscope and after some initial disappointment, because I didn't really know how to use it and the documentation that comes with it is almost useless, I am now quite pleased with it. There is some confusion in reviews here over what this microscope can do -- is it really a 400x power microscope? The advertising describes it as "Magnification: 20x - 400x (Plus digital zoom in 640x480 mode)" Does that mean it can continuously zoom for 20X to 400x? The manual that comes with it does not really tell you how to use it. So I did a little experimentation, and found that it really has two fixed magnifications, appx. 20x and appx. 400x.
There is a cylindrical drum you can twist for focusing the microscope. As you turn it an internal lens moves up and down the barrel, changing the distance to the specimen. On the drum, there's a scale, with markings from 20 to 400 on it, that is quite misleading -- it suggests that you can optically zoom continuously from 20x to through 400x. But that is not the case. Instead, there are two fixed magnification levels, one nominally 20x and one about 400x, corresponding to two different focus locations, and they do not correspond to the locations on the scale you would expect!
Using it at 20x power:
If you place a specimen, like a piece of paper, directly under the microscope and place the clear plastic end of the microscope directly on the paper, the 20x focus occurs when you turn the drum beyond the top of the scale, past the 400, then a little past the 20 mark as the scale starts repeating. At this focal point the internal lens is moved up the tube, far from the specimen. The field of view is 13.5 mm. You can then move the microscope farther from the paper, readjusting the focus as necessary. You can even move the microscope quite far from the specimen, and still be able to focus it with 20x magnification. When it is focused at infinity, (at the extreme end of the scale, about 60 over the top), the field of view is 11.2 degrees, or about 3" wide when the subject is 12" from the end of the microscope.
Using it at 400x power:
To get the the 400x magnification, again place the clear plastic end of the microscope directly on the specimen, say a dollar bill. The 400x focus location occurs when the drum is rotated beyond the bottom of the scale, to the 400 below the 20 mark. At this point, the internal lens is moved down the tube, to nearly as close to the specimen as it can get (about 22mm). The field of view is only about 0.8 mm, or 2 degrees. Most users would never notice that the microscope can focus at the 400x magnification: to attain it you must move the focus lens to nearly the full bottom of its travel; it is easy to go through the focal region too quickly to see it; and the documentation makes no mention of it. People may think the higher magnification is obtained by zooming in digitally on your computer screen, without realizing that the microscope focuses with high magnification itself. You'll need to turn on the LED illumination for the 400x scale to get an image. (There are eight white LEDs that provide good even illumination, not four as advertised.)
Zooming:
As well as these two focus regimes, there is a software zoom option. If you choose a capture size of 640x480 you can go to the preferences menu and choose zoom to zoom in digitally. The field of view zooms from 13.5mm down to 4.2 mm.
Measuring actual magnification:
The 20x and 400x are only approximage values, but you can measure the actual magnification by viewing a millimeter ruler or finer reticule if you have one. If the image capture size is set to 1280x960, I find that the width of the field of view is 13.5 mm at the "20x" focus, and about 0.8 mm at the "400x" focus. (about a 17x difference) The resolution, that is, the size of a single pixel in the field of view, is 13.5mm/1280= 10.5 microns for the "20x" focus, and 0.8mm/1280=0.6 micron for the "400x" focus. (Of course, the optics aren't perfect, and it appears to me that at the "400x" focus the optical resolution is about 3 pixels, that is, the smallest features you can see are about 2 micron in size. The magnification you see on your computer screen depends on the screen pixel size, also called the pixel pitch. Mine is 0.282 mm (or 90 pixels per inch, most LCD screens are 90-100 pixels/in.). For my screen, the two actual magnifications are then, 1280*0.282mm/13.5mm = 26.7x and 1280*.282mm/0.8mm = 451x. This is for viewing on the computer screen at "actual size", not zooming in.
Measuring object sizes:
The software allows you to measure objects with rulers you can draw over a picture, but you need to enter the actual magnification to calibrate the software ruler. They suggest you take that reading from the scale on the microscope, but there's so much up and down play in the focus drum that you can't rely on its readings for the true magnification. It's best to calibrate the field of view by taking a picture of a millimeter ruler. Then you know what true size the full width of the captured image corresponds to. That works well for the appx. 20x focus point. Unfortunately, the magnification box allows entry of only integers up to 220, so you can't enter an actual magnification, like 451, to get accurate numbers.
Even so, you can measure object sizes and do the math yourself. In particular, you can use the software ruler to measure sizes in pixels with a magnification factor of one, and get an accurate pixel measurement.
Saving images:
The software lets you save the images in uncompressed *.bmp or compressed *.jpg file formats. You can choose the level of compression for the *.jpg files; remarkably, the 3.7 MB files (1280x960x3bytes) can be compressed to about 100KB without much loss of resolution.
Image resolution:
Despite the ad hype, the sensor is not a 2 megapixel (Mp) sensor -- the spec sheet in the instruction manual says it is 1.3 (Mp). The maximum resolution is attained when you choose an image size of 1280x960 = 1.23 Mp. Although there is an option for capturing images at 1600x1200, those images are interpolated, and don't result in any greater actual resolution.
With these considerations in mind, you'll find that this microscope is a great value for the money, and you can take some really good photomicrographs with it. " - Microscope - Usb Scope - 200x Usb Microscope - Usb Microscope'
Detail Products
Detail Reviews
Click here for more information
