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Use household stuff |
The right way! |
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The Brunel SP03 Basic
Microscope
If yer want to buy a microscope and follow these projects, the SP03 microscope is a good instrument for its low price. It can be purchased on-line from me Larry's Project Resources page in the Onview shop. There may be other microscopes in a similar price range available from other companies so you don't have to buy the SP03 to follow me projects... but if you did buy this one - at least we would all be getting comparable results. All lenses are glass. Beware if purchasing a microscope from department stores: some have inferior plastic lenses. Right, lets take a quick look at the specification here...
1) 3 eyepieces: x5, x10, x12.5
So what kind of magnification will yer get from this basic model..? You can magnify from 50 to 500 times with the lenses supplied. At some time in the future if yer want to increase this range you can buy additional objectives and eyepieces and push that range wider from x20 to1500x. Beyond 1500x or 1600x - yer aint gonna see anymore. The limitations of light as the 'probing-medium' sets a barrier on resolution - er... that means how much detail is definable. For most of our projects, 500x is plenty of magnification. Let there be light.
Pointing the mirror at the sky or towards 'daylight' from a window is okay as long as the sun isn't directly visible. Better still - is to use an artificial light source, such as a desk lamp. You can purchase a sub-stage light built for the purpose but if yer in a country that's using electricity different from 230 to 250 volts - the sub-stage lamp ain't gonna work properly. So here's a solution and one I use even though I'm on a 230-250volt supply:- You can use the lamp, or one similar - possibly a little halogen spotlight - for both incident and transmitted lighting. You can either shine it on the mirror so the light goes up through the specimen slide from beneath or use it directly to shine down on to the top of the specimen. Is this type of light even? To the eye it aint bad. Most subjects look illuminated evenly. If yer using a microscope to take video or photos then this type of lamp may not be so good because film and Video ccds will detect the uneven bands of light coming from the lamp tubes. A halogen spotlight would work better but you will have to use at colour-correction to get the light to come out white on both video and photographic film. Dust-covers
The condenser can be moved up and down (closer or further to the specimen) so as to optimize the illumination and resolution of the image seen. In the image below, you can also see a round filter holder swung away from the condenser. This is a 'nice' extra to have because it can be used to hold colour correction filters, polarisers, or a dark-field stop, If yer don't know what these things mean, don't worry about it yet: we will be covering all this on later projects! Now, I suppose I'd better show you what
quality of image yer gonna (you are going to get) with the Brunel SP03.
Let's turn the page and take a look...
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