In any industrial imaging application, we have the task of selecting several main components to solve the problem at hand.  The first being an industrial camera and second,  a lens to acquire the given image.  In many cases, our working distance of our lens is constrained and may have to mount the camera closer or further from the object plane.  Once set, this defines our working distance (WD) for the lens.  In addition, we have a given field of view (basically the dimension across the image) of the desired object.

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Given the cheap price and ease of use, we think it's a good investment for jewelers or casual hobbyists as well. The one downside is that you'll have to provide your own batteries.

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A dark field microscope uses indirect light to illuminate your specimen. Find out how they work and when to use one. We'll even teach you to make your own!

Most pocket models have a light on one end and an eyepiece on the other. Some have a tiny staging area, which is a base where you can put small objects and hold them in place while you view them. If there's no stage the microscope is simply held over the object and moved around until you get the right angle.

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Related Blogs:  Demystifying Lens Specifications Understanding Lens MTF Calculating Resolution for Machine vision Contact us to discuss your application and help make a recommendation!  1st Vision can provide a complete solution including lenses, cables and lighting.  www.1stvision.com   Ph:  978-474-0044

FL = ( 10.67mm * 400mm ) / 90mm  FL = 47.4mm Lenses are only available off the shelf in various focal lengths (i.e 25mm, 35mm, 50mm), so this calculate is theoretical and may need an iteration to adjust working distance. Alternatively, if your application can have a slightly smaller or larger FOV, the closest focal length lens to your calculation may be suitable. 1st Vision has made calculating your lens focal length a bit easier!  As in engineering, its good to know the background formulas, but in practicality, like to simplify life with tools

A pocket microscope is exactly what you think it is, a microscope designed to be small and portable. Although many are truly pocket-sized, others are slightly larger. Their small size and varying levels of magnification make them an extremely versatile tool for professionals and amateur scientists alike.

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However, a small microscope may not have enough space to hold the mirrors that correctly reposition the image. Thus you'll always see the picture in reverse. This takes some getting used to, and may be too confusing for some. It's just something to watch out for when buying a very small microscope.

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As you can imagine, there's a wide variety of pocket microscopes out there for a multitude of different uses. These products offer convenient portability and relatively powerful magnification at a cheap price. So whether you want a 30x kids microscope for outdoor fun, or a 100x LED model for inspecting small parts, there's bound to be a product out there for you.

For this exercise, we want to image an object that is 400mm from the front of the lens to the object and desire a field of view of 90mm.   We have selected a camera with the Sony Pregius CMOS IMX174 sensor.  This uses a 1/1.2″ format which measures 10.67mm x 8mm.   We have the following known values at this point:  Field of View (FOV)  =  90mm Working Distance (WD) = 400mm    Sensor Size = 10.67mm – We will calculate for a 90mm horizonal FOV, in turn use the horizontal sensor dimension The basic formula on how to calculate the lens focal length is as follows: FL = (Sensor size * WD) / FOV Using the values from our application,

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One such popular product is the Carson MicroMax 60x-100x Lighted Microscope, which comes in both a standard and LED model. With a magnification of up to 100x, so much more is revealed than with a 30x microscope. The Carson MicroMax also boasts:

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So what's the best pocket microscope? That depends on your needs. Models vary greatly in terms of size, cost, quality, and features.

Although some users lament the fact that there's no stage, this is still a good value for the price. It usually retails for under $15, which seems a fair deal for an instrument that provides a good image with up to 100x magnification.

Although less common now, some pocket models display an image that is reversed. This is due to the microscope using mirrors and lenses to magnify the image, not unlike what happens in your eye.

A digital microscope has many fun advantages, from high picture quality to the ability to share images. Learn how they work, their cost, and choosing one.

This very affordable pocket-sized microscope has a magnification range of 100x to 250x. It has a slide tray that can be folded away to allow for viewing other objects.

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Magnification usually ranges anywhere from 30x to 100x, with some models having variable settings. Most have some sort of light source, and some even have camera attachments that let you take pictures.

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What was once rare is now quite common, and many models come with LED Illumination. One of our favorites is the SE Mini illuminated pocket microscope. It's cheap, easy to use, and gives off a very bright light. Some other features:

If you're tired of constantly changing batteries and want more illumination, consider purchasing an LED model. With LED illumination, the lighting is more powerful and efficient.

This microscope was built for younger kids (6-12), but it's far better than a simple toy. Hours of educational entertainment are granted by the ability to see the world 30 times larger.

It comes with a wrist strap and a clip for attaching a small camera or cell phone for taking photos of what you are viewing.

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For under $10, it's cheaper than many jewelers' loupes and provides brighter light and a clearer image. An extremely versatile product for the price.

A stereo microscope is special in that it produces a 3D image of the specimen. Learn more about these unique models, who invented them and how they work.

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There are two focus mechanisms, one for the magnification levels and the other for fine-tuning the focus. Read more about this one (bottom section) on the illuminated pocket microscope page.

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This is a mini microscope, so it's pretty small even for a pocket model. The diminutive size could be an advantage for those wanting to do horticultural or biological work outside.

In order to select the correct focal length lens which is denoted in millimeters (i.e 25mm focal length), we need additional information on the camera sensor.  Camera sensors come in various “Image formats”.  The chart below indicates some common formats which relate to the sensor size.  The sensor size can be found on the actual sensor datasheets if not available in a given chart.

You will find our lens calculator HERE.  Alternatively as select a camera, you will find an icon to the right which will automatically populate the calculator.  Below is a short video showing how to use this resource from the camera pages.

One of the most popular products out there for this magnification level is the Learning Resources Illuminated Microscope. It usually retails for $10 or less, so they're an easy investment to make. Some features include:

Anti-reflective lenses are designed to minimize distracting reflections and glare on the surface of the lens to improve vision and comfort.

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Looking for something with more powerful magnification than a simple 20x, 30x, or 45x? Some have a power range between 60x and 100x. The higher magnification makes them more suitable for fieldwork, while still remaining easy to use for hobbyists and kids.

These products are popular with parents of small children. They are very easy to use and usually relatively inexpensive, making them a fun and educational introduction to the microscopic world. They're a great gift for the budding scientist.

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