Lens surfaces coated with special anti-reflection coatings will reduce light loss and are particularly useful for low-level light applications.

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The maximum distance the eye can be from the magnifier and still provide a full field of view. Longer eye reliefs generally provide more comfortable viewing.

The Ascent is the biggest Subaru you can buy. It has three rows of seating and is better suited for bigger families than the smaller Forester. The Ascent doesn’t top Edmunds’ rankings for three-row SUVs, but it is a solid contender that’s worth a look, especially at the right price.

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A perfect magnifier would be lightweight, have a large diameter, provide a wide viewing area, and offer high, distortion-free magnification. However, incorporating all of these features into one unit is optically impossible. The magnifying power of a lens depends on its focal length (fl). The focal length, in turn, depends on the lens curvature; the greater the curvature, the shorter the focal length and the greater the power. In the design of a simple, inexpensive magnifier, the lens diameter will typically decrease as the curvature increases to provide higher power. Conversely, as the curvature is decreased to lower the power, the diameter generally increases with a resulting increase in viewing area. In addition, distortion generally increases with an increase in curvature. Thus, a magnifier with a large diameter typically offers more viewing area and less power. So, both wide field of view and high magnifying power cannot be incorporated into a single design without elaborate, weighty, high-cost lenses.

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10" is assumed to be the closest distance the human eye can focus for comfortable vision. An object only 1" from your eye would be 10 times larger, but out of focus. A magnifier's function is to assist your eye in focusing closer. Since a 1" focal length lens brings clear vision down to 1" from the eye, an object at this distance is clearly seen and appears to be 10 times closer than it does when viewed from 10" away. Such a magnifier is commonly called a 10X or 10 power. Using this definition, the magnifying power of a lens can be approximated as follows: MP = 10/FL if the focal length is specified in inches. If the focal length is specified in mm, the formula will be MP=250/FL.

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Ford’s Edge is likely at the end of its life cycle, and it might not return as a 2025 model. Still, the Edge is a likable midsize SUV that has more interior room than the smaller Ford Escape.

Knowledge Center/ Application Notes/ Microscopy Application Notes/ Magnifying Lenses: How to Choose a Magnifier

What Edmunds editors say about the Silverado: “The Silverado boasts four engine options, a massive cabin and helpful tech features. Its ride quality isn’t as comfortable as that of some rival trucks, but we think the Silverado will work out well for most light-duty truck buyers.”

A single lens is satisfactory for low powers. Higher power magnifiers require two or more lens elements for improved resolution and correction of chromatic or other aberrations.

The doublet lens is two simple lenses used in conjunction with each other but not cemented together. The doublet produces an image of better quality because it corrects some of the outer image color distortion.

The simple lens is a single positive lens. Simple lenses are satisfactory for work that requires only low power magnifiers, such as 2X or 3X reading magnifiers. Simple lens magnifiers distort color on the outer fringes of the image and thereby lose sharpness.

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What Edmunds editors say about the Edge: “The Edge comes standard with all-wheel drive, which is an option you’ll not find at the base level in some competitors. It offers ample space and a comfortable seating relative to other two-row SUVs. It doesn’t distinguish itself at being excellent in any one area but rather demonstrates broad competence across the board.”

This story was provided to The Associated Press by the automotive website Edmunds. Josh Jacquot is a contributor at Edmunds.

The distance from the magnifier to the object viewed is the working distance. This distance is an important consideration with regard to the type of work that must be done under the magnifier. If your work requires the use of tools, a magnifier with a long working distance will allow enough space to both use the tools and comfortably view the object. Small working distance magnifiers with higher powers are preferred for close-up inspection work.

Cementing three lenses together produces a triplet lens. Triplets produce a better quality image, are corrected for three colors, and give little or no image distortion. They are best used for jobs that require a great deal of precision at high magnifying levels.

What Edmunds editors say about the Ascent: “The Ascent stands out with its standard all-wheel drive, useful technology features and solid build quality. A tight third-row seat and a loud cabin on the highway are its most significant drawbacks.”

The distance between the closest and furthest points at which a magnifier in a fixed position stays in focus. The depth of field decreases as power increases.

The holidays are coming and so are the car deals. As the year draws to a close, many manufacturers will have end-of-year or holiday sales designed to bring shoppers into showrooms and move metal. In addition to checking out these promoted sales, it can also be helpful to know which outgoing model-year vehicles automakers and dealers are selling at a significantly discounted price.

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Don’t rush to make a deal immediately. Instead look for opportunities to buy at the right price at the end of the month and especially at the end of the calendar year when dealers may be more motivated.

Edmunds collects data on tens of thousands of vehicle transactions every year. And analyzing those data gives insight into where the best deals may be, especially as a calendar year ends. Accordingly, Edmunds editors reviewed sales data from most manufacturers from September of this year to find the deepest discounts. The following five vehicles stood out as viable options for shoppers looking to get a deal. We didn’t include electric vehicles for the purposes of this article but know that you can often get big discounts on them as well.

An achromat is a positive simple lens cemented to a negative simple lens. The primary advantage is that it is corrected for two colors and works well at high powers. Most high quality magnifiers use achromats to eliminate color fringing at the edge of objects.

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Mazda’s small and sporty crossover SUV, the CX-30, was leaving dealer lots at discounts in September. That’s true for both the 2024 and 2025 models. Look for even better deals on the 2024 CX-30 as the end of the year nears.

What Edmunds editors say about the Terrain: “The 2024 GMC Terrain has a comfortable interior and easy-to-use technology features. But a weak base engine and a lack of cargo space keep the Terrain from fully standing out in the small SUV class.

The field of view is the area seen through the magnifier. As power increases, lens diameter and field of view decrease. At 5 power (5X), field of view is about 1.5". At 10 power (10X), it is about 0.5". Usually, it is best to use low power for scanning larger surfaces and high power for small areas.

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Other light-duty full-size trucks except the Ford F-150 were selling at similar discounts to the Silverado in our pricing analysis. Better deals may be on the horizon soon.

Because of physical laws, the lens may produce a prism effect giving the image false color fringes known as chromatic aberration. Simple lenses focus various colors at different points. Achromats with two simple lenses cemented together correct this by causing many colors to focus at the same point.

We’ve organized them by the biggest discount off the manufacturer’s suggested retail price, or MSRP, and included a few notes from Edmunds about each:

The Terrain is GMC’s small SUV. There is a redesigned and improved model for 2025, but you could be satisfied with a 2024 model if you can get a good deal. The Terrain and its Chevy counterpart, the Equinox, were both selling at similar discounts in September.

Actual magnifying power will vary slightly, depending upon working distance, eye relief distance and the characteristics of the observer's eye.

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How much you spend on a magnifier should be determined by the application for which it is being used. Buying the least expensive magnifier could lead to unsatisfactory and frustrating results. Any magnifier you buy should be a tool to fit the rigors of the environment in which it will be used. Additionally, it may be unwise to expect the same magnifier to satisfy the requirements of several functions. Below are several factors affecting the quality of the magnifier, as well as the function for which it is best suited.

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Due to physical laws, the outer part of the image formed by a simple lens may appear out of focus. This is caused by the curvature of the lens. The greater the magnification - and the greater curvature of the lens - the greater the problem. This can be easily overcome by designing a magnifier that has more than one lens. A triplet has a "flat field" which means the entire area of view is in focus and undistorted.

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To choose the correct magnifier for the job, first determine what tools are to be used on the job; then determine the size and the character of the subject; and finally, analyze the object's surface character. Then review the following aspects of magnifiers:

This photo provided by Chevrolet shows the Silverado 1500 full-size truck. The Silverado comes in many different configurations to suit nearly any use. (Courtesy of General Motors via AP)

What Edmunds’ editors say about the CX-30: “The CX-30 is a sophisticated and sporty entry in the extra-small SUV class. It has striking looks and plenty of standard features. Though it’s priced higher than much of its competition, it offers a lot for your money.”