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Customer Review

317 of 325 people found the following review helpful
5.0 out of 5 stars Instructions for use at 400x, 28 Aug. 2010
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This review is from: Veho VMS-004, 20-400x Magnification USB Digital Microscope Camera with 2 Mega Pixel Cmos lens (interpolated) and alloy flexi-stand and measurement software (Camera)
Instructions for Veho VMS--400 USB microscope

I write this as a professional microbiologist. This microscope is excellent but, at first, it seems impossible to use at high power [400x] because of inadequate instructions. I recommend practising on a simple flat object like a small piece of printed paper. Press the microscope firmly down onto it [or put the object into the lens cap] and focus at 20x. Now use the focus wheel to change to high power by rotating anticlockwise as far as it will go from that 20x position and then very slowly moving back until focus is achieved. [Note that it looks as if it should be possible to rotate a short distance from the 20 mark to the 400 mark on the focussing wheel. This is not the case. It is necessary to turn the wheel in the opposite direction to the 400 mark.]
As others have commented it is difficult to focus at 400x because the depth of field is small, the contrast is low and it is difficult to hold everything steady. This is not a fault of this microscope; it is true for the best professional instruments which overcome the problem by being very heavy, having precision engineered platforms for moving the object and special lighting systems (e.g. phase contrast). With the VMS-400 I recommend practicing focussing on a simple object as described above; it also may help to fix it to a heavy base or to place the object in the transparent lens cap. For smaller objects it is helpful to press them between glass slides for viewing at high power.
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Tracked by 9 customers

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Showing 1-10 of 25 posts in this discussion
Initial post: 1 Nov 2010 19:24:51 GMT
DanE says:
This is probably the most useful review I've ever read on Amazon. Thanks very much for taking the time to explain what wasn't at all clear in the included instructions!

In reply to an earlier post on 10 Nov 2010 16:03:29 GMT
Clever Spud says:
Have to agree, excellent post!

Posted on 7 Dec 2010 18:29:32 GMT
The other issue is that the change in magnification is achieved by moving the lens with the sensor stationary. As long as the sensor to object is greater than 4 x focal length of the lens there are two focus positions. However, if you plot the magnification against the object distance from the lens you get a graph that has two stable regimes, one at very high magnification and one at low. The reviewer tells you how to move from one to the other. It is a shame that the intermediate magnifications are hard to use. A real zoom lens would change the focal length of the lens by moving elements within it but this is much more complex.

For those of you like me using a Mac, the driver is poorly implemented. The take snapshot button does not work, the preferences has no options....
Typical for Mac users that the hard/soft-ware producers do implement everything they do for Windows.

If you work at high screen resolution the update rate is so slow it makes focussing very hard.
The stand is in the box where it will remain until I get around to throwing it away.

Overal I thought the device very useful and I daresay I'll use it a lot.

Posted on 23 Feb 2011 21:58:00 GMT
Ray_C says:
As others have stated this is one of the most useful and informative reviews I have read, written by someone who knows what they are talking about. This microscope is fantastic value for the money, it just needs a little care and a steady hand and the results are astonishing.

In reply to an earlier post on 13 Jun 2011 10:55:53 BDT
As those who have gone before, thanks for the succinct and very useful review.

Only this morning I deleted an email reminder to review a product I purchased as I couldn't see why I should help the seller sell product for free. I now see the flipside; altruism is alive and well. I shall retrieve the email from my trashcan.

I am purchasing this product.
:-)

Posted on 12 Aug 2011 08:34:38 BDT
Brilliant, and shows that the internet can make expertise available to everyone.

Posted on 18 Aug 2011 22:44:23 BDT
Thanks for an excellent review. At the risk of being cheeky - may I ask your opinion as a professional? Would it be possible to view bacteria with this? My young son is fascinated by them, and I'd love to be able to show him something real - for example scraped off his teeth!

In reply to an earlier post on 19 Aug 2011 08:57:52 BDT
C. Anthony says:
you might be able to see tiny dots moving about but it could be very frustrating even trying.
contact me at c.anthonyATsoton.ac.uk

In reply to an earlier post on 19 Aug 2011 09:46:10 BDT
C. Anthony says:
2nd reply. I have just spent half an hour checking about seeing bacteria. I failed. Looking at pond water containing a lot of debris i could see moving protozoa and algae but these were not really clear even when viewed through 2 glass slides [to keep things in focus]. If you afford it i recommend the Apex microscopes. Even then bacteria will only be almost invisible moving dots. Protozoa are more fun and easy to find.

Posted on 7 Dec 2011 03:01:01 GMT
G. Morgan says:
Was hunting for a microscope for my 10 year old daughter for christmas....this one sounded almost too good to be true for the money, so I checked out the low starred reviews.....should have checked this one out first.....Brilliant! Many thanks for the time and effort you put in to this.
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