Stand Microscope

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Carl Zeiss OPMI Adjustable Surgical Ophthalmic Microscope 20X Wheel Stand $141.38 (2 Bids) Time Remaining: 4d 14h 37m

Stand Microscope

USB Microscopes - Be afraid be very afraid

Once the domain of serious professionals wearing white coats and working in laboratories, USB Microscopes have fallen in price dramatically and are now genuinely affordable gadgets.

Incredibly easy to use (and addictive) the USB Microscope will give you a close up view of whatever you put in its path, be that skin tissue, insects, strands of hair, stamps, mould and so on. With a magnification of up to x200 (and newer models of x400) you’re able to gather images of remarkable clarity.

The definition if the images is helped by the built in LED light that illuminates the subject and just like using a digital camera the images from the microscope can be captured and then used in documents, posted to web sites or emailed to friends and colleagues.

Most (not all) USB Microscopes will come with a stand that makes it easier to use in some situations. But, the microscopes are not much bigger than a large pen so they are light and easy to handle – not for the fainthearted but one use is the “search for head lice” on children with the images of little blighters shown in start and shocking detail on your PC screen as you move the microscope over the child’s head.

The USB Microscope really is a highly sophisticated bit of kit with loads of serious applications for students, collectors and hobbyists. Use it to examine precious jewellery, watches, banknotes, fabrics, food - the possibilities are endless.

The bundled software aids easy capture and manipulation of any images you gather and with some basic PC editing skills you’ll soon be able to impress your friends with your new view on the world around you.

Take care if you get one for the office because they are addictive and it’s easy to burn though hours just playing with them!

About the Author

Phil is part of the team at USBNow. Launched in 2002 USBNow specializes in all things USB related. If you are looking for helpful advice on your USB related problems or you’re interested in the latest USB products be sure to check us out at http://www.usbnow.co.uk

Finding the resolution of electron microscope?

An electron microscope operates with 5 keV electrons. Calculate the resolution if the aperture angle of the magnetic objective lens is 6 degree.

For a microscope there is a special version of the Rayleigh criterion:

R (m) = 1.22λ/(n.a. of objective + n.a. of condenser)
where
n.a. of any lens = (sinα)/2
α = angular aperture of said lens = 6 deg for the objective lens
So n.a. of objective = [sin(6 deg)]/2 = 0.052

Since we 're not given α for the condenser lens, I guess we'll assume
the objective alone determines resolution (maybe an electron microscope
doesn't have a condenser?):

R (m) = 1.22λ/(n.a. of objective)
= 1.22λ/0.052

Your friend omitted the 1.22 factor Rayleigh criterion factor,
and also she used sinα instead of (sinα)/2 for the numerical
aperture of the lens.

Using the Goosneck Stand for the Dlite Microscope