The spindle of an imperial micrometer features graduated levels of 40 threads per inch. Each turn results in movement of the spindle around an axis of 0.0025 inches, which equates to the area between adjacent graduations on the sleeve.

Commonly featuring a three-anvil head in combination with a solid base, bore micrometers are ideally suited to the accurate measurement of inside diameters. They are particularly helpful when it comes to the measurement of objects situated around machine fluids and coolants.

The reading of the metric micrometer should begin with recording the number of millimetres. An initial reading of 7 would correspond to 7mm. Each half mark on the thimble should be taken into account. This means carefully reading the lower bar and correctly identifying the corresponding number of 0.01mm.

Integrated with decoders for the effective identification of distance, these micrometers present measurements in a digital format.

Micrometers allow for a greater degree of measuring accuracy than alternative tools, such as dial calipers and vernier calipers. They are available in digital, dial, and vernier styles. The term 'micrometer' can be traced back to neoclassical Greece and literally translates as ‘small measure.’

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These come complete with interchangeable anvils, which may be flat, spherical, spline, disk, blade, point, or knife edge. You may be expected to use universal micrometers featuring modular components, which allow for outside, mic depth, or alternative functionality.

Bench micrometers offer extremely high levels of accuracy and are typically used during workplace inspections. They allow for measurement up to somewhere in the region of 20 millionths of an inch, with a repeatability of around a quarter of a millimetre.

This type of micrometer comes complete with matching narrow tips, or blades.They are particularly helpful when it comes to the measurement of specifically shaped objects, such as those with O-ring grooves.

The thread pitch of the needle has a direct bearing on the level of measuring precision. The spindle is machine-screwed to a very high level of accuracy, with the object being measured positioned directly between the spindle and anvil. Some micrometers feature differential screws, which allow for particularly great levels of measuring accuracy.

The round micrometer sleeve or barrel is kept securely in place and features the linear scale. It is also quite common for vernier markings to be found on this part of the micrometer. This scale allows highly accurate measurements to be taken in degrees of .0001.

Purpose-made for external measurement, V micrometers come complete with small V-blocks for the anvil. They are ideally suited to the measurement of circle diameter, with equidistant separation of three points. This allows for the effective measurement of three-flute end-mills and twist drills.

One technique that I like to use on occasion is to add blur in front of the subject as well. This adds a creamy softness to the foreground and the illusion of extra depth. This is achieved by placing your camera in amongst some foliage or flowers, often just a few inches away from the front lens element.

There are various different types of micrometer available, each suited to varying uses and applications. Outside micrometers are one of the most widely used varieties, but inside and depth micrometers are alternatives which may be more appropriate for use in certain scenarios. Below are some of the most common types of micrometers:

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One option is to use the focus bracketing and stacking built into the OM-D line-up of cameras. This allows you to use a larger aperture to achieve nice bokeh yet still have your entire subject in focus. With this technique however, having a subject that is quite still is key to getting good results.

You should gently apply pressure from the thumb in order to turn the micrometer thimble. This part features graduated markings, which should be easy to read.

One of the biggest advantages to using a telephoto lens for your macro-style shooting is the ability to capture a bit of 'wildlife' along with the beautiful blooms. It is a lot harder to sneak up on a butterfly sipping nectar using a macro lens. With a telephoto lens you can be several meters away and still have your subject fill up much of the frame. This will require a closer look at your camera settings since having a faster shutter speed may be important, depending on whether you are trying to capture the insect or bird in flight versus at rest.

The micrometer symbol as used by the International Bureau of Weights and Measures is μm. The micrometer is an SI derived unit of length which equals 1×10−6 metre (SI standard prefix "micro-" = 10−6), equivalent to one-millionth of a metre or one-thousandth of a millimetre.

The next step is to take the reading from the thimble. These measurements are likely to be featured in 0.1 millimetre or 0.01-inch intervals. The final reading should be taken from the vernier scale, which you will find on the sleeve, directly adjacent to the first set of graduations.

Designed to measure the thickness of tubes, tube micrometers feature cylindrical anvils which are located perpendicular to the spindle. They allow for quick and accurate measurements when compared with alternative tools.

If the zero mark on the thimble does not correspond with the datum line on the main scale then there will be a zero error. The reading on the main scale should also equal zero.

The micron is a measurement of one-millionth of a metre, while the micrometer is a measuring tool featuring a calibrated screw.

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Micrometers (otherwise known as micrometer screw gauges) are essential measurement tools used by mechanical engineers, machinists and workers in other technical trades. They enable workers to take extremely fine measurements, which may be displayed in either imperial or metric formats.

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Micrometers feature a calibrated screw, or thread, which is located within the spindle and allows for the device's exceptional levels of measuring accuracy. The screw within the micrometer is used for the conversion of particularly small distances for measurement. The spindle can be moved by turning the ratchet knob or thimble until there is light contact between the spindle and anvil. Each 360-degree turn of the spindle has the effect of adjusting the space between the measuring displays by 0.05 in metric and 0.025 inches in imperial.

In order to understand how a micrometer works, you should first consider the key components of the tool. Analysis of the components should also further your understanding of how to read a micrometer.

Micrometers and Vernier calipers are both commonly used to establish the sizes of different objects. However, there is some contrast between the efficiency and usage of each of these tools. Calipers might be used to establish physical dimensions, interior measurements, exterior measurements and depths. However, micrometers are generally used for more specific purposes such as measuring exterior or inside dimensions. The expected accuracy of Vernier calipers is typically between ±0.001, with the accuracy of micrometers generally being ±0.00005.

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Peter has been a dedicated Olympus shooter for nearly 40 years, and has found a way to combine his passion for photography with his love of teaching to develop photography workshops with a focus on landscape, wildlife and astrophotography. Peter’s work has been published in a number of magazines including Canadian Geographic, Shutterbug and Outdoor Photographer. He maintains his own blog with an emphasis on tutorials that assist others in bringing their photography up to the next level.

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​The best compositions are often the simplest ones. The easiest way to isolate your subject and make it stand out is to have a blurry, or defocused background. In large part this is determined by your choice of aperture, which not only establishes how much of your subject is sharp, but will also determine the degree to which your background blurs. A large aperture will create a softer background, but may not provide you with enough clarity throughout your subject. So achieving the perfect result is a bit of a balancing act and may require some experimenting with different aperture settings. Selecting a subject that is set a fair distance away from the background will also help isolate it in your final composition.

Micrometers are the ideal tool for the measurement of cylindrical and spherical shaped objects. In order to use a micrometer, you should follow these steps:

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When using a metric micrometer, It is necessary to acquaint yourself with the number scales that are displayed on the micrometer thimbles. It is common for the top line of the sleeve to feature millimetres, with the line below that featuring half millimetres.

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The quickest and easiest way to convert micrometers (um) to millimetres is to divide by 1000. An alternative method is to move the decimal point three units to the left of the original figure.

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Standard one-inch micrometers have readout divisions of 0.001 inch and an accuracy level of ±0.0001 inch. However, you must ensure that both the micrometer and the object being measured are at room temperature for this high level of accuracy.

There are 25 graduations on the thimble, meaning that the measurements can be divided the corresponding number of times. The visible reading corresponds directly to the number of whole divisions that are featured on the sleeve scale, multiplied by 25. This means that the resulting diameter is displayed in thousandths of an inch.

I often use macro photography as a quick escape. Whether I use a true macro lens or one of my telephoto lenses it is a great way to get out of the house for a short period of time and explore my immediate surroundings. It also helps me focus on the details when I'm out shooting landscape images. If you are new to this style of shooting it is good to experiment using a telephoto lens that you already have. You can practice good field technique before making the investment into a dedicated macro lens.

Different types of micrometers have measuring ranges of between 25mm and 1 inch. This translates to the incremental metric measurements of 0-25mm, 25-50mm, 50-75mm and so on. The imperial versions are equal to 0-1 inches, 1-2 inches, 2-3 inches etc. Boxed micrometer sets can also be used for the purpose of taking micrometer readings across a wide range of sizes.

The integrated ratchet thimble will ensure a high level of measuring accuracy, with this key part functioning as an integrated torque wrench. The process should continue with the turning of the ratchet handle until a repeated clicking is heard. This will provide the assurance of taking the measurement with a consistent level of torque.

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There are 25,400 micrometers to every inch, with 1 metre being equivalent to 1,000,000 micrometers. You should also be aware that each micrometer equals 3.9×10e-5 (with e meaning to the power of).

If you want to avoid such calibration issues then you must take an exceptional level of care, carefully cleaning, using, and storing the micrometer for continued use. It might be necessary to perform micrometer adjustment and recalibration in some instances. However, adjustment won’t be sufficient when it comes to correcting issues such as the micrometer being misshapen or of the incorrect size. Repair will be necessary for such instances.

Republished with permission from Peter Baumgarten's Creative Island Photography Blog. View the original article or leave comments for Peter here.

OM SYSTEM makes a variety of telephoto and supertelephoto lenses. Given their minimum focusing distances they are excellent for macro-style shooting even if they aren't true macro lenses.

Micrometers are specially designed for the measurement of very small objects. They allow for the highly precise measurement of any item that fits between the anvil and spindle. Standard types of micrometers can be used for the fine measurement of items under one inch in length, depth, and thickness. However, there are some advanced models that allow more precise measurements to be taken. There is also the option of investing in anvil micrometers for the measurement of diversely shaped and sized objects. Portability, ease of use, and measuring consistency are just a few of the key micrometer advantages.

The vernier micrometer reading is displayed in the format of 0.001 mm or 0.0001 inches, establishing the size of the object with extreme accuracy.

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Digital micrometers feature electrical circuits, which allow for digital measurement and exceptionally accurate readings. The measurement will be displayed clearly on the LCD screen.

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Otherwise known as the thread mic, this tool features a specially designed set of thread-shaped tips for successful identification of the screw thread diameter.

Situated next to the measuring faces, the micrometer spindle is projected towards the anvil as a direct result of contact with the thimble.

You should be aware that fluctuations in temperature are likely to adversely affect the micrometer reading. Remember not to keep your micrometer in your pocket or within a working environment with excessive heat levels.

The micrometer reading test will involve the measurement of guide blocks in order to ascertain the desirable accuracy. If such a gauge block is known to be 0.75000 ±0.00005inch then the micrometer should give a reading of 0.7500 inch. If the corresponding measurement is 0.7503 or more, then the micrometer will be deemed to be out of calibration.

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Using a micrometer integrated with the vernier scale, the reading should be taken from the sleeve index line. This allows for precise readings, within 0.001mm. The initial reading should be taken from the sleeve. The measurements are likely to be featured in intervals of 0.25 millimetres or 0.025 inches.

It is highly important to maintain the stability of any object that you are measuring with a micrometer. The object should be kept parallel to the anvils and a consistent level of pressure should be applied when taking the measurement.

When you want to get in real close to your subject, you are entering the realm of the macro photographer. Usually this means you need a specialized macro lens, one that allows for extremely close focusing distances and provides a reproduction ratio of at least 1:1. For some subjects this may be your only choice, for example, capturing the minute details of an insect. For situations like that I will grab my M.Zuiko Digital 60mm F2.8 Macro lens. But often I want to capture a great close-up of my subject, giving it the macro 'feel' without actually being all that close. That's when I put on a longer lens and turn to telephoto macros.

Particularly well suited to measuring the thickness of tubes, micrometer limit mics come complete with two anvils and two spindles, functioning as effective snap gauges. The gaps correspond directly to the upper and lower tolerance levels.

The micrometer anvil should be noticeably shiny. It should ensure that the spindle gravitates towards the object, which is firmly secured. The anvil will be kept in consistent contact with the part and may chip unless a high level of care is taken. Quality models typically come complete with carbide-tipped micrometer anvils, which allow for an extended tool-life.

The micrometer ratchet stop can be found on the end of the handle and it restricts the amount of pressure by enabling movement at a calibrated torque.

Ball micrometers have spherical anvils. They are used for purposes such as measuring the thickness of walls and establishing the distances between holes and edges. As opposed to tube micrometers, the ball variety can be used to correctly identify the measurement of alternative rounded surfaces.

Micrometer frames are c-shaped and ensure the optimum positioning of the anvil and barrel. Frames may take a variety of shapes and sizes, allowing for desirable functionality of the micrometer. The hub-shaped frame is ideal for taking highly accurate measurements in confined spaces.

Micrometer accuracy may be considered in relation to two key factors - the accuracy of the screw thread (or digital scale), and any process errors. The expected accuracy of a micrometer as established using the Vernier scale is 0.01mm.

The spindle micrometer locking nut is a particularly helpful feature when it comes to maintaining awareness of the measurement and securing the spindle for small lot gauging. Some micrometers come complete with lock nuts, while others have locking levers. Where possible, it is advisable to choose the locking lever variety due to the relative ease of use and maintenance.